How to build a barrel pump

I saw a post a while back about making a barrel pump and I thought I'd show you how I make mine. I've made more than a few and it is much easier if you and some friends decide you want one because they are labor intensive but they are pretty simple to make. You need a drill press and an adjustable hole saw like you see in the first picture. I made a 6" pump this time, but a 4" is the same. It is helpful to make test cuts with the hole saw because they are hard to adjust. The plastic I...

How to build a barrel pump