SpudFiles

Im going to build a coaxial piston valve gun and wondering if these plans sound good, im just going to put this stuff together and not glue it but when I get enough money for a bigger chamber then glue it. k, about 9'' of 2'' diameter pipe for the chamber, and 9''of 3/4'' for the barrel. A ball valve for pilot and the fill valve off a capped T joint near the valve. As a piston.... any suggestions? Some kind of pvc fitting, and what do i use as rubber to seal to the barrel? I saw a 2'' piston made of a bushing or something back on the forums but cant find it anymore. Give suggestions to make it better

well 9" sounds a bit shortfor a coaxial but i havent been around coaxials too long so maybe its fine. for a 2" barrel 1 1/4" sch 40 couplings or end caps with a wrp or 2 of duct tape work well. rubbers not entirely necessary but helps seal better

Also, an easy way to create a seal is to attach a 3/4" rubber coupling to the barrel so the piston presses up against it.

also where can you get ahold of normal schrader valves in the US?

I usually get 'em from Grainger or McMaster-Carr (www.grainger.com and www.mcmaster.com)

You can usually pick up schrader valves from a hardware or automotive store. Lukemc, rubber is required to seal, unless your piston is made of rubber or the barrel has a rubber coupler on it.