Made my pump from an empty flavored lube bottle.
https://www.ama … /dp/B0041HZVHK/
BTW, this thing makes a great dildo. It is what I used to introduce the wife to dildos about 5 years ago. She had actually bought some flavored lube, so I knew I was safe bringing it home and one day as we were having fun with the lube, I slid it into her and she went nuts. Not long afterwards, I bought an actual dildo and some extensions and she is quite the fan of those.
Anyhoo, all you need is this bottle, a knife, epoxy, some sort of fitting, high pressure stiff hose and a piece of rubber hose which fits over the high pressure hose.
I cut the bottom of the bottle off, cleaned it up with sandpaper, wrapped the opening with about 3 turns of good electrical tape. When you wrap it, hang half the tape over the edge of the tube, then fold it inside the tube. This makes a great seal.
This bottle has a popup valve. Pull it and the liquid flows. Push it and it closes. Yank the cap off, drill out this valve and epoxy in place some sort of fitting that will take the high pressure tubing. Use about a foot long piece of the flexible black rubber hose at the end. You can suck on this, then bite it to hold the vacuum. If I have a good seal and want to hold for a while. I stick a golf tee in the end.
This thing works awesome in the shower. It weighs virtually nothing. Can be use with air or water. I typically use warm water in the shower.
Out of the shower, I will wrap it with a heating pad. IMO, the heating pad really gives you better expansion.
I am about 6 BPEL, 5 BEG, 4.75MEG. It is the perfect fit for me. I have been using erratically for a few years and have seen definite girth gain, I think, but no accurate before measurements to quantify it. If I gain much more girth, or length, I will outgrow it. If you are much bigger than I, you’ll need a different tube.
I think sucking is a great way to go. I believe you have better vacuum level control.
As soon as I get enough posts, I will post some pics.