Aside from doing what a pump should be doing, one thing I though was worth mentioning was the suction on this pump. It is tight and others have not given the seal that you are looking for sure they vacuum pack you but you gotta look at the cylinder to know it’s a good pump. Out of the ones I’ve tried and used, this one works the best. The others worked as long as I held the tube upright, as soon as I let it go and it leaned over, the suction would be lost. With this one I had no such problem; it stayed upright and held the suction and that is very important. I could even get it to hold pressure on just the head of my penis. If you want to impress that certain girl or even guy whatever you are into, this little added bonus that others cannot deliver is great too!