I was going to make my own vacuum pot but decided to try this first as the acrylic and valves and such would honestly cost me probably as much to DIY. Well so far for me I have been able to take it down to -27/-28 inches mercury a dozen times without issue. The pot valves hold the vaccum no problem if left to idle (Shut with no pump on) as I already tested. There really isn't anything bad that I can say about this product other then the picture they show makes it look wider and shallower then my product which was taller and deeper. It's actually good for my use case but that could mess over others trying to do things as a heads up. Overall happy. (Side note: In case you are not aware you'll need a vaccum pump and oil too use this. This is just the pot.)