I agree. Unmodified ie with the wine vac, the bathmate cannot produce near the amount of vacuum produced with a hand pump such as with the Mityvac. However, I am a little concerned as to safety. I have used both the bathmate (with wine vac) and the cylinder that accompanies the mityvac, although in my case it is the Pro Vac, but the principle is the same. I can only guess what the max vacuum pressure is with the bathmate(using the wine vac), as there is no gauge. But given the way it feels, I estimate it is upwards of 20 hg and probably more. Most agree that 10hg is the max for safety, but that amount of pressure, in my experience, does not allow for major stretching power without pulling the cylinder off. Even with the Bathmate, and using the wine vac to it's highest vacuum possible, I can easily pull the bathmate off if I pull hard enough. And that's not pulling very hard. From side to side it takes even less of a pull. In my estimation, the amount of vacuum required to keep the seal while pulling with an appreciable amount of pull would be close to 30 hg or even more. I think this could potentially be a dangerous amount of vacuum. Those of you who are doing these kinds of stretches, whether with a bathmate, mityvac cylinder or other, I would ask: what amount of vacuum is required to keep the cylinder locked in and sealed while pulling with a strong pull? In order to determine this, a gauge is required, so the bathmate does not qualify. In my experience, unless the pull on the cylinder is modest (not hardcore), the amount of HG vacuum required for hardcore pulling would have to be dangerously high.
I think maybe you missed my point. I also can walk around and do "rudimentary chores" with either cylinder, but what I meant was...How much vacuum is required in order to do hardcore stretches? My point is that an extremely high amount of vacuum is required in order to pull on the cylinder with any significant amount of force without pulling the cylinder off. To avoid that, and make those stretches really "hardcore," you need more than 10 Hg, with or without water. Sure, you could use 10 HG and that might be sufficient to walk around the house or vacuum your carpet, but if you were to grab the cylinder and pull really hard, you would break the vacuum and pull the cylinder off. My point was that in order to do "hardcore" stretches, you need more than 10 hg vacuum. A lot more! And that, I submit, could be dangerous.
Since I got my Pro Vac cylinder, I'm regularly pumping up to 15 hg and even more. I don't have to worry about sustained pressure, because the cylinder will not sustain that pressure and gradually and steadily declines. When it gets back down to 6 or 7 hg, I pump up again. Wish I could get a good seal and not have to do this, but I've tried just about everything I can think of to get a good seal. Shaved my entire pubic area, apply Vaseline to the rim of the cylinder etc. Makes no difference. Air continues to gradually leak out. I do not have this issue with my X40. I pump to where I want and it holds until I release the vacuum. I used to have a Vacutech cylinder, and it held without any problem either. I think the common denominator here is that the base of the X40 and the Vacutech cylinder cover more surface area than the MOS cylinder, providing more area to seal. the X40 of course has the thick, wide comfort cushion, and the vacutech cylinder had a flared base. I should emphasize that this has nothing to do with the diameter of the cylinder. My pro vac is 2.25", but the X40 is wider at 2.5". By the way, I've discovered that if I pump up to 15hg, I can pull on the cylinder quite strongly and it holds. But the vacuum doesn't, so in a minute or so, I have to pump up again. I think I might use my X40 more often, as it holds the vacuum perfectly. Only trouble is, I have no idea how much vacuum I'm applying, because there is no gauge. But using the wine vac, I expect the vacuum is quite high, probably 15 hg or more. So, I have to rely on how it feels and try not to get carried away with the wine vac.
Yes. The X40, with the comfort cushion on, measures 2.5" at the opening. Take off the cushion and it's 2.75" My ProVac cylinder is 2.25"
There are cylinders on MOS Shop, all the way up to 3.5" diameter now.
A size for everyone from an extremely professional pump