Apart from a simple floor pump, you'll need some PVC hose, a check valve (that lets air in one way and not the other), and a hose clamp. Essentially, all you need to do is reverse the piston and ...

A good piston like this one is versatile: it can be used in anything from like vacuum pumps to DIY water guns. While it might not be the sexiest part of any build, a piston could become one of the ...