I picked up a U.S.D. 3/4" valve on EBay that is described as a "clanker" (which name was worth the price of the valve all by itself). It apparantly works by slapping a teflon button against the inside of the tank when one is "on reserve".
What I'd like is a better idea how they were used. It has, instead of an up-or-down reserve arm, a spring-loaded arm that functions very much like a toilet flush arm, being spring-loaded and returning to center when released, with an eye on the end of that lever that looks like a pull rod could be attached. Do these valves function like the usual J valve, where they stop passing air until you pull the arm down, and then clank until you run out of air, or do they work in some other manner?
Thanks- Al.