Girth work What size pump cylinder to order? How to accurately measure your penis for pump cylinder sizing!

The rule of thumb is if you are focusing on penis length , order a MityVac pump cylinder in a diameter that is closest to the thickest part of your erect penis girth (see measurements below). The idea is to pack your erect penis in the cylinder and pump so your penis only extends in length since it can't expand much in girth.



Order a MityVac pump cylinder that is .25" larger in diameter than the thickest part of your erect penis girth. This will allow your penis to expand in girth and length at the same time. Ordering a pump cylinder that is much wider than the girth of your penis is not beneficial and will actually cause you to grow a deformed penis over time. So stick with the recommendations we provide, this is all data collected from pump users over the past 20 years.



Get a piece of string, thread, wire, etc.

Get your penis erect.

Wrap the string around the thickest part of your ERECT shaft or base (whatever is thickest).

For most people, the thickest part of the penis is at the base of the penis by the pelvic bone. In some cases, some men have a thicker upper shaft. If this is the case, measure the thickest part of your shaft.

Mark where the string where it overlaps itself with a pen so that you can see the pen mark on both ends of the string.

Lay the string on a flat surface and measure the distance between the two pen marks with a ruler.

If your erect girth measurement is:


4” to 4.75” Order a 1.75″ diameter pump cylinder
5″ to 5.75” Order a 2″ diameter pump cylinder
6″ to 6.75” Order a 2.25” diameter pump cylinder
7″ to 7.5” Order a 2.5” diameter pump cylinder
7.75” to 8.25” Order a 2.75” diameter pump cylinder


If your measurement is not listed here – Please Contact Us

NOTE: Be sure to use string to measure circumference. A tailors tape or flexible ruler will not provide accurate measurements.

The MityVac standard cylinder length is 9.25 Inches.

Going to buy a MityVac - Wet and Dry Penis Vacuum Pump System,but I f I buy the 4,75 cylinder,I'm actually 4.75 5 girth what I'm supposed to buy??

Getbiglonger7 said:

Going to buy a mity vac,but I f I buy the 4,75 cylinder,I'm actually 4.75 5 girth what I'm supposed to buy??

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I would guess you could go for 2"

Thank you commodore

Can I order the 2.5 cylinder despite the fact that my base girth is 6 inches? Will I be able to use it?

Secondly, what's the base measurement of the hydromax X40?

Base measurement of the x40??

Getbiglonger7 said:

Base measurement of the x40??

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The hydromax X40

Actually the x 40 can take 9 inches lenght..

Getbiglonger7 said:

Actually the x 40 can take 9 inches lenght..

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I know that. I want to know if it is a 2.25 or 2.5 pump.

Ok problem solved

Getbiglonger7 said:

Ok problem solved

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Problem not solved. I'm yet to get an answer to my question

Yep you want a new pump yep ask for the features n check them on Google

Getbiglonger7 said:

Yep you want a new pump yep ask for the features n check them on Google

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The answers are here on the forum

Yet you haven't found it? I remember from heart that @Big Schwanz Acht mentioned the X40 / 9 being 2.5" in diameter. Of course that measuring is "give or take" as the pump has the gaiter system.

I don't know why to consider the Hydromax though. If it's more readily available compared to the MityVac - Wet and Dry Penis Vacuum Pump System, then sure. Basically pumping is about a decent, well-fitted cylinder and good suction. Easy enough to get brake bleeder kit to transform pretty much any air pump to a hydro ...

arkailija said:

Yet you haven't found it? I remember from heart that @Big Schwanz Acht mentioned the X40 / 9 being 2.5" in diameter. Of course that measuring is "give or take" as the pump has the gaiter system.

I don't know why to consider the Hydromax though. If it's more readily available compared to the Mityvac, then sure. Basically pumping is about a decent, well-fitted cylinder and good suction. Easy enough to get brake bleeder kit to transform pretty much any air pump to a hydro ...

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I want a pump that can take me to 7.5 inches. A member on here has a 2.5 cylinder and he get 7.5 inches base girth right after his session. If the gaitor is removed from the Hydromax X40/9, do you think it can take me to 7.5 inches base girth?

I don't believe that because @Big Schwanz Acht is 7 inches base girth if I understand correctly. If I understand correctly, a 2.5 cylinder is suppose to take me to 7.5 inches girth not 7 inches girth.

What do you think?

TuffDong said:

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TuffDong said:

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Duuuh duuh ok mistress know it all

huge-girth said:

Can I order the 2.5 cylinder despite the fact that my base girth is 6 inches? Will I be able to use it?

Secondly, what's the base measurement of the hydromax X40?

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Measured my x40 just for you buddy LOL
It's not round at the base, so that's why you get 2 diameters per measurement.

With gaiter: 2.44" x 2.51"
Without gaiter: 2.83" x 2.91"

So - yes, I would count the x40 as 2.5" cylinder

I think I've met this member's member in-person.......

F26 said:

Measured my x40 just for you buddy LOL
It's not round at the base, so that's why you get 2 diameters per measurement.

With gaiter: 2.44" x 2.51"
Without gaiter: 2.83" x 2.91"

So - yes, I would count the x40 as 2.5" cylinder

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Alright thanks for this. But the pump Tuffdong is using is giving him a base girth of 7.5 inches. Can the X40 do the same thing?