I know they are not hard to make. I have a couple that I’ve made before as well. Getting a good seal on the round bits can be tough, plus some fellas hardly have the time to prospect let alone build a sucker in the garage.I made a lot of these and give them away to friends . They are EZ to make and a lot cheaper than buying one. The plans are on-line somewhere. I used 2 inch PVC pipe an most of them and I tried a 3 inch PVC also. I used some Stainless Steel rod for the pull rod and welded a "T" handle to it and I threaded it on the other end 1/4-20 and I used a circular gasket cutter to cut out several circular pieces of Butyl Rubber for the suction part of this device. It worked fine BUT down the road I wanted to install 2 check valves so I could push / pull this device to speed up my useage instead of just sucking material . Pretty simple device and construction. A added plus for me was that I had the parts already !