Waste of money for me. I read and re-read the instructions. It would not draw me up into it. Since I have ED, I bought it since it worked on a vacuum. I re-seated the check valve, tried different positions installing the sleeve, and finally use the squeeze bulb from a penis pump to get enough vacuum. No workie at all. I worked my hands to death. But, the can it was shipped in was nice, even if it added zero value to my purchase. Too bad it had a label printed on it describing what was inside for everyone to see. In short I am very displeased.
Too much work, too big to handle. That's my opinion though ... and I say that because it is well made.
Think you can't push on a rope? Think again. The little white check valve is what makes it work. Deceptively simple, so read the directions carefully and you'll soon get the hang of it.