Bathmate How Much Should I Pump
In our evaluation of the Bathmate we examined the entire penis pumps that are part of the Hydro series, which includes the Hydro, Hydromax, and Hydroextreme models. We provide in-depth testing and analysis services. Bathmate How Much Should I Pump
With more than one million happy customers, a satisfaction rate of 95 percent and a unique technique that can increase the size of your penis in an average 2-3 inches up to 5,
Bathmate’s vacuum penis pumps have an impressive presence on the market for products for male enhancement.
The reason is that it can be used as an option to treat erectile dysfunction, Peyronie’s disease, rehabilitation following prostate surgeries, a dramatic increase in penis length and girth, or enhanced sexual pleasure due to erectile dysfunction (ED), Peyronie’s disease (Peyronie’s) and increased sexual pleasure: erectile augmentation
Everything you should know about Bathmate Hydropumps can be found in the article.SHOP BATHMATE
Bathmate Review: What is Bathmate Penis Pump?
The following are the four main components that you must comprehend:
1.) The Tube where you are expected to place your penis.
2.) The Comfort Ring, which should be placed at the top of male genitals (without any testicles). The reason for the name is because it is possible to push the Bathmate tightly into your body. This prevents any air from entering and leads to the creation of the formation of a vacuum. It is not possible to expand its size or its circumference if the seal you have isn’t correct.
3) The Pump. When you squeeze the penis against your pelvic seat and the water is released by your grip, and then when you release your grip, the penis is “pumped” through the creation of vacuum pressure. The penis is made of a tough skin that can be used repeatedly. You are in complete control thanks to the ability to squeeze lightly or firmly.
4) The Latch Valve. This lets you to customize the pressure, and it can be closed and opened using just one hand due because of its ergonomically designed.
How Does a Bathmate Hydropump Work?
When the tube is filled with water in the Bath or Shower, the water pushes the air out from the inside of the tube.
After inserting your penis in the tube, you then place your Bathmate tightly against your body near the penis’s base while holding it inside the tube.
Since the comfort ring is pressed against your body, it’s difficult for air to get in the ring, which creates a vacuum.
When you take water through the tube reaction results in the vacuum pressure to draw in blood to your penis.
This draws blood into your penis to counteract the change in pressure inside the tube, which puts the heart at a lower pressure. The reason for an erection is an increase in the flow of blood around the penis, and its duration is determined by how sexually stimulated a person is.
An erection could last up to a half-hour. If you want to grow its size, you’ll need to work it regularly.
Growth to the length of the penis are a requirement for a program in the same way that muscular growth does.
Bathmate suggests that you use your water pump every day for at least 4 to 6 months for a total of 15 minutes which is broken down into three periods that last 5 minutes each (a total of three 5 minute use).
As your penis grows larger as it gets larger, you’ll need to replace your previous Bathmate with one that is one size larger.
Similar the way you raise the weight of the dumbbells that you use to lift weights.
How Do I Use a Bathmate Hydropump?
No matter which penile pump from the Bathmate Hydropump product line–the Hydro7 or the HydroMax or the HydroExtreme, which you select as the one that will help you reach your goals with the greatest efficiency, the manner in how you apply each item to your penis is similar.
1.) Give yourself five minute to immerse yourself in warm water to soften the skin on your penis and scrotum.
This will reduce the likelihood that your testicles will get drawn inside the unit. When you are ready to make use of the Bathmate device, ensure that your testicles are away from the tube by bringing them back using the hand that’s not being used to place the device.
Even if there is no risk of injury in this situation however, it will be very uncomfortable.
2) While in the shower, hold the Bathmate upside down until it’s being sprayed by water, but make sure the black hole on the device’s top is closed.
There is no need to shut the clasp on your Bathmate in case you intend to use to bathe in it. all you need to do is immerse the device in the water.
3.) Place your sagging penis in the tube and press your Bathmate firmly on your pubic bone to make sure the tube is sealed properly.
Bathmate penis pump Bathmate penis pump is inclined either downwards or upwards, depending on which feels more comfortable to the user.
4.) To begin pumping, first remove the cap that is black from the device’s bottom and then open the cap.
Each time you pump, you will see brief bursts of water to be released.
You will feel your penis being drawn into the chamber. You will also notice that your skin is stretched.
In the wake of the shift in pressure, the blood vessels in your penile area will begin to dilate and lead to the development of an erection.
Because of the way that the water distorts vision and the shape of your penis will appear like it has increased.
5) Before removing your penis from the tube remove the quick-release valve by pulling the valve cap upwards to let the vacuum out.
This must be done prior to taking your penis out of the tube. If your Bathmate is not inserted firmly enough into the pubic bone to secure the device, pumping while you’re showering can be more difficult because air can come in and reduce suction.
This happens if the device is not secured properly.
Begin pumping as soon as the cap that is black at the end of the device has been removed; if you don’t the water will pour from your Bathmate Hydropump. If you discover that air is getting trapped between the comfort ring and the pump, you might be able to remove the comfort ring before filling it and replacing it when pumping makes the process simpler.
More pressure can be obtained with shorter, quicker pumps, whereas lower pressure can be achieved using slow pumps.
It is beneficial to let off the vacuum, then refill the apparatus, and start pumping two or three times during the 15 to 20 minutes session.
This will enable you to achieve the biggest improvements possible from each workout.SHOP BATHMATE
Are Bathmate Hydropumps Safe To Use?
As long as they are correctly used and the directions that are provided by the manufacturer are followed The Bathmate vacuum pumps will not cause any harmful undesirable side effects and are non-invasive.
Penis extenders offer an alternative to the traditional penis pumps. Penis injuries can happen as well, but one of the most common causes is excessive pumping of the sexual organs.
When performed too frequently or for a long duration, excessive pumping or misuse can result in injury to the tissue, which may result in less erections.
“Men will over-pump,” says Dr. Christopher Fox, a senior lecturer in sexual health at the University of Sydney.
Due to this, there is a risk of damage to the penis’s vascular system.
It is highly recommended that the procedure is carried out under the supervision of the therapist for sex who is knowledgeable of what they are doing , or another pumper who has previous knowledge of the procedure.
The advice from experienced users is to make sure the water is warm, massaging the penis with a massage to loosen the muscles before beginning the exercise, and begin by introducing a beginner’s program that runs between five and ten minutes each day, and then gradually progress to sessions that last twenty minutes.
There is a loophole to this rule if you’re taking warfarin or a different kind of anticoagulant that thins blood, or if you have any medical condition that impacts how your blood is clots.
Which are the circumstances under which the usage of Bathmate Hydropumps or any other penile pump can be considered to be safe?
Fluid retention is among the negative side effects commonly associated with utilizing the penile pump which is water-based.
This occurs when the suction that has drawn blood flow to the penis has also drawn in fluid. This is a sign that the penis is at its maximum capacity.
As a consequence of this, the skin that covers the penis gets swollen and the penis’s circumference increases.
It has no impact on the growth of the penis, but it could induce a doughnut-shaped enlargement at the base of your penile’s glans.
After twenty-four hours, this should go disappear, but it will depend on how much fluid retention you have. According to the recommendations made by Bathmate, the most effective method to avoid fluid retention is to break up long sessions lasting 15-20 minutes into shorter sessions that last 4-5 minutes.
Which is Better, Bathmate Hydropumps or Traditional Air Pumps?
Short answer Answer: Bathmate Hydropumps.
The benefits inherent to warm water, making the penis’s tissues more flexible and improves natural blood flow by dilation of the vascular system, are used in Bathmate pumps to enhance their effectiveness.
The effects of warmth are conditioned on nerves, which prevents the discomfort that occurs during stretching, which is something that those who utilize standard air vacuum pumps commonly have reported experiencing.
The same effect can be reproduced by first applying a warm towel to one’s penis for a couple of minutes before using a standard pump.
If you do, however, use the pump prior to playing spending more time on preparation means less time away from playing.
It is evident that which of the two options – having the feature integrated into your routine for pumping or adding an extra step – will provide you with the greater degree of convenience.
If air pumps are used, lubrication is required to maintain the penis’s suppleness during the stretching process However, this requirement can be avoided when water is utilized.
Water is more dense than air, and can provide an equal distribution across the penis because of this property.
Bruising is one of the effects that can be triggered by air pumps. It’s due to parts of the penis which have excessive pressure applied to them due to an uneven distribution of air.
This might result in bleeding beneath the skin as well as tiny red spots on the penis. A gauge that shows the current pressure is usually included on traditional pumps.
If you exceed the maximum pressure it is impossible to let the pressure go, and air will continue to compress inside the tube regardless of the means to vent it.
It is up to you to decide how much is sufficient pressure and to ensure that it is not exceeded.
Do you know what the ideal pressure is for a specific scenario?
If you pump too fast or too hard, the one-finger valve on Bathmate Hydropumps will release the pressure.
The possibility of pumping the maximum profits without risking injury due to the design of the Bathmate, which prevents water from entering the tube, and as a result, pressure right from the start.SHOP BATHMATE
What are Bathmate Penis Pumps Used For?
According to the results of a poll carried out in 2020 by Bathmate the results showed that 70% of respondents had seen a size rise.
Premature ejaculation. A mild numbing effect can be achieved by using a bathmate hydropump for five to ten minutes immediately before engaging in sexual activity.
This can help the session to go on for longer. You can also avoid premature ejaculation through training your penis to stay erect for extended durations without any sexual release.
This is another method for preventing premature ejaculation. If your penis is pressing on your Bathmate, you won’t be in a position to feel relief from pumping your legs until you get it removed first.
Harder erections. In the same poll conducted for 2020 Bathmate, 76% of respondents reported having more powerful erections.
Furthermore, you can accomplish this by pumping prior to sexual activity while wearing a penis rings.
Once you’ve taken off your Bathmate the ring will prevent the blood pulled into the penis from escaping as rapidly.
This will keep your erection stronger for an extended period of time, and will prepare you for your partner.
It is important to be aware that the ring has to be snug against the body for the erection to remain, which may be uncomfortable for some guys.
Stimulation of female organs, and the foreplay. When you get an erection you might experience intense sensations of excitement, and when you consistently experience a strong erection your desire for sexual encounters can increase.
Vacuum penis pumps produce erections while using them, but they have also the capacity to increase the number of natural erections and greater intensity of orgasms.
Penis pumps create a satisfying sensation that can be very enjoyable, and they are a great choice for masturbation as well as foreplay with the areas of edging, light control and complete dominance.
This makes them extremely versatile and versatile toys.
Although they weren’t designed to be used on body parts other than the ones you are using it is possible to get imaginative with them.
The pump can be used on the clitoris, nipples, and any other erogenous area without risk.
Bathmate Penis Pumps Review For Erectile Dysfunction
Oral medications, drugs that are pushed from the penis’s tip into the tube that is inside, shots that you inject directly into the penis as well as surgically implanted penile implants are prone to cause adverse reactions and may not work, or be downright dangerous.
Bathmate Hydropumps, when used correctly, increase the oxygenation of penile tissues, which aids in maintaining the length of the penis after an operation to remove the prostatectomy.
In addition, they can help minimize the possibility of abnormal fibrous tissue growing in the penis.
This helps to ensure the erectile functions are maintained.
Erectile dysfunction sufferers who use vacuum penis pumps are able to achieve an uneasy erection, and also report a considerable improvement in their sexual satisfaction.
The range of this percentage is between 80 and 90 percent.
The treatment of a Bathmate Hydropump to treat erectile dysfunction is, as compared to other treatment options cost-effective in the long term, and non-invasive and can be used alongside other medications.
Additionally, it may assist men in regaining sexual function following surgery.
In treating erectile disfunction with the Bathmate Hydropump you have the option of making use of it right before engaging in sexual activity to stimulate the flow of blood and create an erection.
You can also build a regular routine in which you make use of it a minimum of five days every week and work your way up to 20-minute sessions on a daily basis.
This will improve how natural your erections are, eliminating the need for you to take Bathmate before you engage in sexual activity.
Penis Pumps & Prostate Health
Nerve damage and shrinkage of the penile are both frequent adverse effects of prostatectomy being seen in about 70% of patients and both side effects get worse with time.
Clinical studies have proven that those who utilize the penis pump vacuum are able to keep the size of their penis prior to surgery and recuperate sexual function faster after surgery.
The absence of natural erections could be due to postoperative nerve damage, which can lead to a decrease in the amount of oxygen reaching the tissues of the penis. It could be that a deficiency in oxygen may result in the development of fibrous tissue and consequently of this, long-term erectile dysfunction.
On the basis of several research studies, medical professionals suggest the use of penis vacuum pumps during rehabilitation to help boost blood flow into the penis and maintain tissue.
This can help to avoid this from happening. For instance, in the study carried out in 2011 13 men who underwent prostatectomy combined the use of a penis pump and the drug tadalafil (20 mg three times a week and daily pump usage five days per week) The results were compared to a control group of 7 men who received 20 mg of tadalafil by itself.
The group that was treated with tadalafil experienced less improvement in erectile dysfunction.
Those who used the penis pump scored higher scores for penile resistance on the International Index of Erectile Function.
Furthermore, 92 percent the men in the penis pump group were able to go from a sexual relationship to orgasm, whereas just 29 percent the men who were in the tadalafil only group were able to achieve this.
Following the surgery, another 42 men started using the penile pump on a regular basis for a total duration of 90 consecutive days.
Only one of the men saw a decrease in length of the penile of at minimum 0.4 inches.
In comparison to the typical 48 percent of men who experience a significant decrease in penile length following prostatectomy when they are not given rehabilitation with the help of vacuum penis pumps, the percentage of patients who receive this treatment is significantly more.
Penis pumps that utilize the use of a vacuum have shown a clear and significant impact.SHOP BATHMATE
Bathmate Review For Peyronie’s Disease
Peyronie’s disease is a non-cancerous condition where the penis grows fibrous scar tissue that causes erections to be extremely bent and painful.
This condition is caused by the development of Peyronie’s disease.
Peyronie’s disease may prevent men from engaging in sexual activity, induce erectile dysfunction, and shorten the shaft of penile.
The pressure put on the penis with penis vacuum pumps can cause plaque to degrade or be repaired. This ultimately leads to the penis curvature becoming straighter.
The efficacy of vacuum penis pumps was studied throughout the course of a year in a study that included 31 males diagnosed with Peyronie’s disease.
The treatment produced significant improvement in the length of the penis, and the curve of the penis was also was improved in 21 males.
Men who have Peyronie’s disease must only utilize the penis pump when the condition hasn’t changed for at least three months and their curvature isn’t extreme after two sessions per day for several months.
This is an important thing to remember.
Do Bathmate Penis Pumps Increase Penis Size?
As per Dr. Christopher Fox, “Men who use penile pumps recreationally report big gains in sizes. Of course, the size decreases if you don’t maintain the pump, but men who do report significant gains in sizes.”
Based on the results of clinical studies those who have used penis pumps that are vacuum-filled for erectile dysfunction experience the highest levels of satisfaction overall.
Bathmate offers the claim to be substantiated on their website . It contains impartial reviews, results and endorsements as well as before-and-after videos of healthy penises. They say they gain 30 percent in penis length and girth following using the product for six months.
According to a poll carried out by 2020 of 12,000 customers of Bathmate, 81 percent claimed that they had more erections, and 70.6 percent said they had longer erections after having used the product for two months.
When just the HydroXtreme was looked at, 92.9 percent of users had noticed improved erections and 80 percent of them reported improved or longer erections, or both.
Your penis will grow in length and circumference when you continue to use it frequently.
But, you’ll need to continue utilizing your Bathmate in order for any gains to last around.
If you do not keep up with the work, you’ll get rid of the results similar to when you’re working to build muscle in the gym.
There is very little evidence to suggest that these devices bring about any significant long-term gains in terms of size, says Professor Wylie, who is an expert consultant in the field of sexual medicine. In a study published in 2011 and titled ” Non-invasive methods of penile lengthening: fact or fiction,” the researchers concluded that there was no evidence to back the idea that penis pumping can result in permanent changes in size even when they’re not used continuously.
The size of the penile can be maintained for longer time in men who utilize an penis pump between three and five times per week for 20 minutes, but should they stop using the pump for even a few days, their penis shrinks back in size to what it used to be prior to when the first time they began pumping it. However, if you pump your penis, you’ll see a brief increase in size.
With continued use an already larger penis is not only maintained but also substantially augmented in size.
This is enough for certain men, but when you look at it in the context of what makes a 20-minute daily workout any different than a skin routine or a workout that’s the same length, when the outcome is a significant improvement in confidence in the bedroom?SHOP BATHMATE
Which Bathmate Hydropump is Best for Me?
Bathmate Hydropump Bathmate Hydropump product line is available in various sizes. The size that’s right for you will not just be based on your existing size but also what you hope to accomplish using the penis vacuum pump.
If your normal penis size is that number of inches or less when it’s standing up and straight, the model of the product that is most suited for you will be HydroMax3.HydroMax3 model of the product.
Other examples of models with numbers include the HydroMax5 model as well as the HydroMax7 model.
If you’re planning to use the HydroMax5 penis, you’ll require penis that’s at minimum 4 inches tall. for the HydroMax7, you’ll need one that is at minimum 7 inches tall and so on. It is vital to choose the appropriate size for your Bathmate hydropump in order to obtain the most effective outcomes from it.
This allows a baseline to be set for future improvements However, if your pump is not of the correct size, you will not be receiving the proper pressure, which may result in either zero results, or outcomes that are less appealing or a bad experience.
How to Correctly Measure Your Penis Size
1) Take your measurement with your penis erect.
It is measured from the top of the penis, that is, the one facing yourself when you look at yourself from the side.
The measurement is not taken along the penis’s bottom which is located closer to the testicles.
2) If you have excess pubic hair or fat pushed towards the side, take a measurement of length in inches of your tailbone all the way back to your pubic bone.
3) To measure girth, carefully wrap the tape measure around your shaft in the point where it is the thickest.
Make a note of where the two ends of the tape meet.
For a start, you can use the Bathmate’s size calculator website to choose the best pump for your measurements, simply enter your length and girth measurements in the measurement units you want to use.
The Bathmate Hydropump Product Line
Bathmate offers their Hydro7 kit for users who are new to the sport and HydroMax and the HydroMax as well as the HydroMax Wide Boy for experienced users, and HydroXtreme and the HydroXtreme and HydroXtreme Wide Boy for experienced users looking to maximize their growth in size. All of these products can be found through their web site.
Hydro7 formerly “Bathmate”
It was the first Hydropump from Bathmate that was released into the marketplace in the year 2006 with the brand name “Bathmate Hercules.” Hydro7 revolutionized the penile pump market since it was water-based and priced half the price of the closest rival.
The Hydro7 is suitable for people with penises between 5 and 7 inches in length when they are erect and was developed to help the ordinary consumer beginning off.
Three colors are that are available for the Hydro7: red, white, and blue.
When ordered directly from the Bathmate website All of Bathmate’s hydropumps come with a sixty-day refund policy during which there is no question asked, a 2-year warranty, and free shipping.
Because Bathmate has distribution warehouses across the globe The majority of orders will be fulfilled within 5 business days and all products will be delivered in unremarkable packaging, that is not marked.
Bathmate HydroMax Series
The Hydromax line of vacuum penis pumps has been the widely utilized penis pump in the world and has a customer satisfaction rate that is higher than the 92 % of the customers who were surveyed.
The pump has more power than the Hydro7 pump, which makes it ideal for advanced users who are looking for steady but substantial growth or those with an erection length that is longer than 7 inches.
Bathmate HydroXtreme Series
The HydroXtreme series is designed for advanced users who are trying to achieve maximal gains in size as quickly as is possible.
Bathmate’s Bathmate HydroXtreme penis pump has the handball as an additional component that helps increase the pressure, and also provides 35 percent more suction than comparable pumps.
The HydroXtreme line from Bathmate has five different versions Each comes with a free accessory package.
For customers who have outgrown traditional vacuum penis pumps, the HydroXtreme range of products offers choices ranging in size from HydroXtreme5 to the HydroXtreme11.
The HydroXtreme11 is the largest penis pump that has ever been invented.
Cleaning Kit ($46.98). A collection of accessories to keep the high quality the pump.
This kit is vital, despite the fact that it is charged an additional fee when you pay.
It is due to an opportunity for a high level of bacteria growth in warm water The pump also needs to be maintained free of dirt so that the rubber can maintain its malleability.
Cushion Rings ($14.98. Additional cushion rings can be added to the pump’s base before usage to make the procedure of pressing the seal into the pubic bone more enjoyable and less painful experience.
The Capsule Travel Case ($46.98). It is a sturdy case that protects your pump from harm and keep your personal information private while you travel.SHOP BATHMATE
How to Get the Most Gains with Your Bathmate Hydropump
What is Jelqing?
Bathmate suggests the usage of jelqing as a manual workout to be employed in addition to Bathmate’s Bathmate Hydropumps.
Jalqing originates from the Middle East as a rite of passage that dates back to ancient Arabic civilizations. Jelqing can be beneficial in warming the penile tissues, preventing fluid retention, and also in training and making your penis prepared in a safe manner for the more intense pressures exerted by the hydropump.
In addition to the Bathmate Hydropump, it is recommended to make jelqing a part of your regular practice.
1) Make sure the penis is warmed up and flexible prior to expanding blood flow by applying hot water or a warm towel to the region.
This will enable the penis to expand more easily.
2) Apply lube, and by using a firm grasp, encircle the base of the semi-erectcock.
Repeat this process repeatedly. When you move the grip, make sure you only apply pressure in one direction, working from the base up to the tip, and you should not pull the skin back.
3.) It is crucial that you never jelq with a full erection; beginners should stop jelqing once their penis is at 50 per cent of an active erection following 150 reps.
This percentage can be increased to seventy five percent, then ninety percent. However, novices should not jelq with an entire erection.
Build a Workout Routine With Your Bathmate’s Hydropump
It’s crucial to keep up the flow if you wish to acquire penile growth and keep those you have, because doing so can help sustain the gains.
This entails formulating a regular exercise regimen that is tailored to your specific time and space constraints, goals, and the amount of effort you think you can put into it.
People who support the Bathmate Hydropump with more experience categorize routines as “Newbie,” “Intermediate,” or “Advanced.”
If you’ve been using jelqing for a long time, your level is determined by how experienced you are with Bathmate Hydropumps.
It is essential not to overdo it , and to gradually increase to more intense workouts using a pump for vacuum and this is because of the same reason it is crucial not to overdo it when gaining muscles.
You are able to experiment using the many Bathmate Hydropump routines that are available inside each level to determine which ones will cause your penis to react most positively.
A simple routine that is suitable for beginners would be as follows:
- Week 1 & 2 2: Pumping sessions lasting 5 to 10 minutes four times each week.
- Week 3 & 4 Sessions of pumping that last between 10 and 15 minutes 5 times per week.
- Week 5 and 6 5 and 6: Pumping sessions lasting 15 to 20 minutes, 6 times each week.
Be sure to take at the very least one relaxing day each week is essential and that you shouldn’t exceed six hours of relaxation.SHOP BATHMATE
Alternative Vacuum Penis Pumps to the Bathmate Hydropump
Bathmate hydraulic penis pumps, as proven by its award from it the Venus award for best new product in 2014, and the prize for the most effective male enhancement device in 2012.
Penomet, much like Bathmate, is essentially a water-based vacuum pump which can be utilized within the shower or in the bath, or as an air penis pump.
The versatility of the pump makes it an ideal alternative.
Penomet makes use of an AquaPressure technology to create the ideal vacuum pressure.
Penomet pumps can be adjusted, constructed from polycarbonate plastics that the company claims are virtually unbreakable.
Additionally, they manufacture five gaiters made from medical-grade silicone, each with the suction force.
When you get a Penomet with all 5 gaiters and you’ll be able to utilize the same pump from the first time you utilize it through numerous years of penile enhancement and training in the future. Making use of different models of Bathmate
When your penis grows by a specified percentage, all additional gains you achieve will be limited to maintenance only till you can upgrade your model that has more space as well as a greater suction. It is easier to track your progress in the realms of training, growth or recovery if you rely on only one model. Penomet’s products come in a range of sizes, including The Force 60, 65, 70, and 75, and the Extreme Force 80 and X85 Monster Gaiter The latter is the main rival to Bathmate’s HydroXtreme11.
After more than 10 years of research and testing, it was found that Penomet devices used for six months and six sessions per week led to up to a 20 per cent increase in length and a 30 percent increase in thickness and a boost with regards to the general quality of protracted erection.
Penomet, much like Bathmate offers a money back guarantee for the first 60 days as well as a guarantee that lasts for three years. A two-year warranty is offered by Bathmate.
The initial cost is the biggest drawback of Penomet penis pumps compared with Bathmate hydropumps.
When compared to the Bathmate HydroXtreme11, which retails for $399, Penomet Premium package, which comprises all gaiters ranging from the novice gaiter to the Extreme Force 80 gaiter, comes with a suggested retail price of $457. Bathmate How Much Should I Pump