How much vacuum can you create with your mouth when water pumping?

How many HG’s can the average guy pull with his mouth water pumping? When I do it theres seems to be a point that is beyond my lung capacity to add pressure. I have been doing water pumping for a little under a year and it seems to be fool proof for me this way because unless i keep pulling and draw another breath and pull and so and so on i dont have any bad side effects. Eventually I will put in the work to get a waterproof gauge in line, but if anyone could comment would be great.

I’ve wondered that myself, with pumping in general and applying vacuum via your lungs. (I hope you’re pulling vacuum and not adding pressure!)

My mouth is the only vacuum source I use for pumping. I can easily pull 15 Hg with my mouth, not that I ever pump that high. I just did it momentarily for a test. The trick is to suck with small breaths, capping the tube with your tongue in between sucks. I’ve built a 12” long tube that I use for water pumping. That way I have an air gap at the top of the tube that keeps my gauge dry and dick water from getting in my mouth. Works like a charm.

You shouldn’t have any problem making more vacuum than you’ll ever need.

I use an aquarium check valve so I don’t have to fiddle with maintaining a vacuum myself.

They’re like $1.90 at Walmart, so buy some spares!

If I am not mistaken, the female connector in my cylinder acts as a check valve. I use a bulb pump for water pumping and use my mouth to fine tune the vacuum pressure and never loose the vacuum. The check valve could be in the bulb pump, but I think its in the female connector. I’ll need to check to be sure.

The bulb would have to have some valving otherwise it wouldn’t pump. Don’t know about your particular female connector, though.

Thanks for the responses. Im definitely pulling vacuum Lamp, haha. I have a quick connect coupler on my tube and an inline shutoff valve. The female part of the coupler holds pressure when the male is disconnected but is not a check valve. That aquarium check valve is something im definitely going to add to my set up. That sounds alot easier than fidgeting with my my valve after I have pulled some vacuum.

Tdmakur thanks for responding, I had no idea that this kind of pressure could be had with the mouth. I do 30 minute sets and add vacuum every ten minutes or so. If I stop lengthening in the tube then I stop adding vacuum. I always kinda figured that was another indicator that I was in a safe zone. But maybe im wrong on that also.

I don’t stop lengthening in my tube till about 10 hg. I say this to simply point out that it would not be a safe indicator for me to use. I pump at 5 hg which does get me almost to my erect length at the beginning of my sets, and by the end I can be longer than my erect length. At the beginning of my sets at 10 hg I will be around 7.8” and at the end of my sets if I pump up to 10 hg I will be around 8.1” hg.

I give this detailed information to give an idea of what my unit does. I often pump without a gauge and without a pump, but, I have used a gauge to understand what 5 hg feels like and on average what length I would be at.

Like others, I have pulled 14 hg with my mouth so a pump is not needed for the vacuum. 5 hg is very easy to achieve with your mouth.