i found that my shut-off valve is innoperable. when pulling a vacuum, there is no resistance. i even sucked by mouth after multi-vac and had a great seal, but i could just suck air (i'm sure i've been told that behind my back).

anyone know where i can get one of these do-dads at a decent price? or a diaghragm kit? I found one place online $150, it is the canister type, doesn't look like i can open it to change a diaghragm.

thanks