Bought both the Vacuum Pump Head and the larger size tube as an idea over their standard model. I bought several different size input cushion seals covers and found the right comfortable fit. Now I am by no means "Small or Medium or Large. I have a 3..75" diameter or 9+ circumference on a 9"+ stick. Yes the wife and her GF love every inch of it and the results of using this pump head and tube. One point for those of you starting down this type of stimulus, DO NOT EXPECT INSTANT REWARDS! Using this pump you must take time, Like a fine wine, workout on this vacuum can be to much and it is painful I'm told. Slow, Steady workout with no discomfort as you go. It actually is fun to watch them do my routine for me. Don't expect a drastic result, I've gained 1/2" in diameter and am now working on 10"+ for length. No pain to me, wife is 20 years younger and her friend is 17 years younger. Me? 70 next year and they still cannot keep up with me. But we all sleep very well!
