slight vacuum loss - thickwall pump

Hey guys!
My thickwall pump has arrived. I tried it for the first time today:
-used lube generously on the glans and shaft but not on the balls obviously (I stopped with the lube at the last cm of the penis)
-used lube inside the cylinder and on the opening

Then, I inserted my 40% erect penis and pushed the cylinder strongly into my pelvis. After that, I pumped very slowly, up to 4 hg.
Everything works fine, except:
There is a very small vacuum loss. It is just barely noticeable, but I timed it.
When I am at 4 hg and stop pumping, the vacuum decreases to 3 hg in 41 seconds.

Is that correct or should it stay constant? And if so, how to ensure this.

All the best :-)

In theory it should stay constant. In real life there are several things which can cause a decrease in the vac level.

As your penis increases in size, the vac level will decrease. Once dick size has stabilized, the vac level should also. If you kegel while in the tube you can see the gauge needle move up and down slightly as your penis reacts to the kegeling.

Sometimes I pump to a higher vac level (7-8inHg) to ensure a tight seal, then back down to 5. I also twist the cylinder back and forth a little into my pelvic area for the same reason.

Pubic hair is one of the greatest source of poor seal.

If you are moving around you can cause micro leaks. If you need to move, press the tube in and hold it until you re settle.

Support the tube with a pillow (or whatever) to keep it in an upright position and minimize it flopping around.

Other than these, you’ll need to check fittings and connections for leaks. Check that the pump release valve is fully closed. Some types have a tendency to stick open a little. Also pay attention where you place the pump to make sure the release valve is not making contact with something.

Just one more item. Check to make sure the female quick disconnect is firmly tightened into the cylinder, but not too tight.

During the first minute or so after pumping to 6 hg, I have to add a pump to return the vacuum back to 6 hg as my dick continues to expand. I do go in my flaccid. Even after five minutes, I have to pump a bit more every five minutes as my dick continues to slowly expand further.

If you disconnect the pump from the cylinder once you are at the vacuum level you want, and the vacuum drops at the same rate, you know it’s not a loss at the pump.
It’s not often the female coupling atop the cylinder if that’s tight enough and the seal is undamaged either.
It’s most commonly either the penis expanding in the cylinder, or a poor seal between the body and the cylinder. We all know the saying ‘nature abhors a vacuum…’. Well it’s true - if air can sneak into that cylinder, it will! To get a really good seal you need to shave the body areas the cylinder sits against and lube them. Or if you pack the cylinder at the base, ensure your shaft is shaved and lubed, and that will provide a good seal.

Frankly I don’t worry if I have to top up the vacuum as needed.

Thanks for the amazing help, guys!
1) my pubic hair is completely shaven, so this cannot be the issue
2) I used the cylinder on my stomach and tested if vacuum was still lost.
Interestingly, I didn’t seem to loose any or at least ultra slowly!
This means for me that both the pump and the female cylinder coupling is fine
and it is indeed the seal between cylinder and body.
Is this conclusion logical?

Because if that is the case, my idea is that maybe I cannot pack the tube enough and
this is the issue. I am 5.5 inches in a very uniform way from tip to base and ordered
a 2 inches cylinder. When I pump up to 5hg ( I dont want to do more atm), I cannot
completely pack the cylinder. My idea was that this may hinder perfect sealing.

I heavily lube the base up as any dry skin can cause a leak. Also, those quick disconnect fittings can be a little finicky. Just because you have a good connection this time does not mean it will be good always. Any slight pressure on the hose can pull the male fitting to one aide or the other and allow a seepage.

That’s a “can allow” not meaning it will always happen.

You don’t need to be packed to get a good seal.

What everyone else has advised is spot on.

I’m the same girth. I have the same size cylinder, 2”, thick walled, wide flanged. I struggled with this until last week. Essentially you should, be clean shaven, use lube, pull ball sack down and out of the way on both sides, double check the coupling at the top.

For the very first time I was able to decouple the pump from the tube. For weeks I “played” with the pump, restoring pressure. Thanks again 32Quarters!

I put lube all around the rim of the tube. When I attach it to my body, I twist the tube around back and forth before I pump up. That seems to give me a strong tight seal. I use water based lube mixed with a little water. There’s also some vaseline type stuff made for pumping. When Vacutech was around, they sold it, but I got some other stuff from pump toys (I think) that’s similar. It’s also very good for jelqing or edging, never dries out. I don’t use it that much because it’s more difficult to wash off at the end.

I’m in favor of lubing all the way down the base. The liquid will fill microscopic gaps and create a better seal.

No matter what, there’s always some amount of leaking, though.