rebuilt key houston pinch valve with new us made humprey air control valve , piston bore is free of scoreing ,  all new seals , these are the simplest deadmans around keeps your blast pot pressured up instead of blowing down each time you let off the deadman handle (not included , but uses standard one's) these imported  sell new for around 175.00 less the valve which costs 75-85 bucks by themselves untill the import knockoffs these pinch valves cost a hundred or so more and you can tell in the casting