Iuse a six shooter for gas but it needs a new pump line, it got hard sitting around after a year or so when my gassers were down. Ialso have used the hand pump from Tower, can't remember what happened to it?? Maybe I gave it away to a student or something. My back up to my electric is a Magnum and I'm now using it for my gassers. They all have the same vanes and gears so I haven't found or seen any difference between the makes, they all work great. Igave a fellow $5.00 for the magnum NIB.