You don't want to get too wider a tube, if it's ratlin around in the tube it's too big. I would say looking at that guy he's been doing it a few years and he's getting good results. Best thing I've found is to pump at low pressure for the longer period, between 3 and 5 hg. Longest I've pumped for is a 3 hour session, with nice results. My only draw back is I can't but help get a really large donut. My foreskin is a free moving one and I need to pull the tube outwards to get the skin to roll over the head for best results, that also cuts down a tiny bit on the donut. I would think if your lucky enough to have one of those really nice tight big foreskins that are hard to pull back you get a nicer looking pump. Some people like the big donut, I don't mind but like the thick all the way down look more. My 2 stage tube is good for that doing your balls as well, in warm water. Then you can move on to the S8 tube.