It’s the question everyone needs to know the answer to before they buy a Bathmate.  Use the chart below to determine which model best suits you.  For best results you will need to know 3 measurements –your girth, width and erection length.

I discuss more tips for picking the right model at the bottom of the post.

After now purchasing the X20, and comparing it to the x30 and Hercules, I can confirm max measurements, which you’ll see below for each pump. Both research and careful measuring has been done to provide you the hard to find stats on all of this brands pumps.

If you are having any reservations on getting one, then taking a look at the other options for getting bigger can give you a better idea of how it compares. It never hurts to be sure. After-all, the best results will come with regular use, which takes commitment. If you aren’t committed to this, then by all means; save your money!

If you are committed, then get excited, because you are one step closer to having a mighty penis.

Hercules

The Hercules is the companies first and most recognizable hydro pump model (also the one I first started with). It has been updated a couple times, with the latest model being Gen 3. Skeptics and those on a budget typically go for it as it is an affordable entry into the hydro-pumping world, that lets them see what it’s all about. It can hold 22oz of water, and the average mans penis -which is what you really want to know. Here’s the specs:

It Will Comfortably Fit

• • Erection Fit 7.08 inches and under
  • Girth Fit 5.69 inches and under
  • Penis Width 1.81 inches

Max Capacity

• Max Erection Length up to 9.75 inches
• Max Girth 7.07 inches
• Max Penis Width 2.25 inches

Hydromax x20

The x20 came out late 2015, and filled the gap in the series for us smaller-to-average guys. It has all the performance advantages of the hydromax series, but with a smaller profile that fits those with less length, where using a larger pump was a waste of space and didn’t provide as good of suction.  It has a water capacity of  around 18 oz, holding about 5 oz less than the x30, while providing better suction for those within its intended size range.

It Will Comfortably Fit

• Erection Fit under 5.08 inches
• Girth Fit 5.19 inches and under
• Width 1.81 inches and under

Max Capacity

• Max Erection Length up to 6.75 inches
• Max Girth 6
• Max Width 2

Xtreme x20

The xtreme version of the x20, like all the others you will find below, comes with the added benefit of a hand ball that offers extreme control over the pressure in the pump, which is ideal for men that plan on pumping up before sex. Other than this amazing benefit, it is identical in size with the lesser hydromax x20.

It Will Comfortably Fit

• Erection Fit under 5.08 inches
• Girth Fit 5.19 inches and under
• Width 1.81 inches and under

Max Capacity

• Max Erection Length up to 6.75 inches
• Max Girth 6
• Max Width 2

The shorter length and circumference of the comfort sleeve offers ideal performance for average guys. Also, the x20 and x30 have interchangeable comfort sleeves, so if you do outgrow the sleeve on the x20 you can purchase the one on the x30, which will save you some coin.

Hydromax x30

The Hydromax series is the most popular, and notably come with 35% more suction power. This new model also features a newly designed leak-proof valve and rotatable body.  It has a water capacity of 23 oz, making it 1oz larger than the Hercules, but with more suction due to the stronger gaitor and updated valve.

It Will Comfortably Fit

• Erection Fit under 7.08 inches
• Girth Fit 5.69 inches and under
• Width 2 inches and under

Max Capacity

• Max Erection Length up to 9.75 inches
• Max Girth 7.07
• Max Width 2.25

The x30 may be the same size as the Hercules, but the gaitors provide more usable room in the tube as many users found after removing the comfort pad.

Hydromax x30 Wide Boy

This is the pump the average length guys with above average girth will need. It is identical in length with the standard x30, but possesses the width and girth size of the x40. Most users will outgrow the girth of their pump before length, and because so the best-selling x30 size range needed to provide the logical next step up for it’s users that didn’t mean buying an overly-long x40. This choice now gives those that have above-average girth but average length an accurately sized pump for them that offers ideal performance.

It Will Comfortably Fit

• Erection Fit under 7.08 inches
• Girth Fit 6.91 inches and under
• Width 2.20 inches and under

Max Capacity

• Max Erection Length up to 9.75 inches
• Max Girth 7.70 inches
• Width 2.45

The x30 Wide Boy is the same length as the x30, but possesses the girth and width of the x40.

Xtreme x30

The Xtreme is the newest model in the Bathmate lineup. It takes your pumping to a whole new level by adding a convenient hand ball extension to the mix. Now you can more easily edge your way to the pressure you want to be at without having to sacrifice an already great seal by pumping the whole unit down as you would with the Hercules, x30, x40, and goliath. It is exactly the same size as the x30, but gives you much more control over the pressure.

It Will Comfortably Fit

• Erection Fit under 7.08 inches
• Girth Fit 5.69 inches and under
• Width 2 inches and under

Max Capacity

• Max Erection Length up to 9.75 inches
• Max Girth 7.07
• Max Width 2.25

The added hand pump allows the user to increase the pressure of the tube without compressing the gaitor, increasing the usable tube length by easing pressure off the pelvic region from the normal down-pumping motion.

Hydromax x40

15% larger than the x30, this model can hold up to 25 oz of water, and also has 35% more power than the Hercules, and all the same features as the x30, but in a slightly larger size. It is the 3rd largest hydro pump on the market.

It Will Comfortably Fit

• Erection Fit 8.46 inches and under
• Girth Fit 6.91 inches and under
• Width 2.20 inches and under

Max Capacity

• Max Erection Length up to 11 inches
• Max Girth 7.70 inches
• Width 2.45

Xtreme x40

The xtreme version of the x40 came out after people had some time to review the x30 xtreme. I jumped on the bandwagon and bought one a couple weeks ago. I figured it was a worthy investment since it came with more room for girth growth, and I wanted to see how the pump and comfort pad faired. Needless to say I love the hand pump and comfort pad -they make a huge difference in ease and comfort of use. However, the thing is just huge. It’s a half inch shy of the Goliath in length, and even though I just wanted extra room for girth growth I feel kinda stupid for using such a massive pump. I can live with it though, but it would be nice to see a wider range of sizes from BM down the road.

It Will Comfortably Fit

• Erection Fit 8.46 inches and under
• Girth Fit 6.91 inches and under
• Width 2.20 inches and under

Max Capacity

• Max Erection Length up to 11.5 inches
• Max Girth 7.70 inches
• Width 2.45

Xtreme x50

The x50 Xtreme replaced the now discontinued Goliath in 2017. Dubbed ‘Goliath’ for a reason –it was a behemoth designed for those over 9 inches in length. Now, the big-guys have the x50 to turn to.  With a capacity of 45 oz the X50 is the biggest water pump sold today, two times the size of the Hercules. In fact it is so big the Hercules fits inside of it! This pump is no joke, and like all the others, it should only be bought by those who fit it.

It Will Comfortably Fit

• Erection Fit 9.84 inches
• Girth Fit 8.14 inches and under

Max Capacity

• Max Erection Length up to 12 inches
• Max Girth 8.46 inches
• Max Width 2.75 inches

Important Notes

If you want to grow you should buy a model that offers room for you to grow. More importantly you should decide what direction you want to grow most.

Want Girth?

• Girth growth typically happens before length with pumps, so getting one with 1 inch or more extra room girth-wise would be advisable if you want outward expansion. Realistically you can see .5-1.5 inch growth in girth with pumping (depending on your starting size), and that’s over a couple years. Once you reach maximum tissue expansion gains become harder. That’s where the sobering reality of enlargement comes in… when it comes to this area the most damaging thing someone can have when doing any kind of enlargement activity is unrealistic expectations. They kill your motivation when they aren’t met, and can even cause damage through overzealous exercising. So, realistically, If you have 5.5 inch girth then you should at most get a x30 as it has a max girth of 7 inches. You have 1.5 inches to grow, which is more than enough room to grow into. You’ll be overpaying if you buy the x40 or Goliath, and be stuck with a massive pump that you’ll feel kinda stupid using.TL;DR: Buy the one that has around 1-1.5 inch extra girth room for your penis.

Want Length?

• If you max out girth wise then naturally more suction will be applied to the length of your penis, causing length gains to happen.  I’ve definitely noticed this effect as I started to max out the available width in my Hercules as I have an oblong shaped penis that is wide and not a perfect circle circumference. For most the base of the penis is the thickest -which is true for me and is where I’ve maxed out in width in the Hercules. I’ve noticed that more suction is applied to the areas that aren’t as thick, which is slowly creating a more consistent girth around the whole penis and not to mention gains in length. If you want length, then get a Bathmate model that more closely fits your girth (but won’t too tightly constrict it or you’ll have a hard time taking it off).

Keep this in mind if you want length over girth, or visa versa.

If for some reason the size guide doesn’t work for you, and you end up with a poor fitting one, then don’t fret –you can exchange or get a refund, so you will get one that fits.

Where to Buy?

The sheer amount of online retailers selling this device can make it tough to pick the right store, but fret not, for you I’ve tested a couple of them, and the one I link to on this page is ran by the manufacturer themselves. They ship worldwide, and express shipping is FREE -which is big because a lot of times stores have cheap prices but AWFUL shipping rates and painfully-slow delivery (Example: I paid quite a bit on one store that took over 2 weeks to deliver).

The store I recommend is Lovehoney, which is a hugely popular online retailer of adult toys, with customer service that is at the top of the ladder in quality. Returns are prompt an easy, and ordering is a breeze. They are a retailer of loads of male enhancement products, including Bathmate’s products, so the added benefit of ordering there is adding other products you’d like, and getting it all delivered at once. Here are the sizes for sale on Lovehoney. You’ll also get free shipping with your order.

If you want to know more, the Hercules was my first hydro pump, and the Xtreme is what I am using now in my phallosan and bathmate challenge. Here’s why I upgraded.

Update: I’ve just realized why so many are confused in the comments below as to whether to get the x30 or x40, and it’s because I made the mistake of suggesting the x40 in the example in this section. I meant x30, and have fixed it.

Also note that most of the recommendations in the comment section below were made before the release of the x30 Wide Boy and the x20 models, and were based on what pumps were available at that time. Now there are enough sizes available to meet the many different forms of penises, that questions of which size to get aren’t as frequent or necessary.