Quoted from "Wet_Boots" You could always take your exacto knife to an old inner tube and make your own diaphragms. I see the smiley face, but I'm tempted! Thanks.
My sprinkler system has Imperial brass valves; I don't know how old the system is, but I've owned the house for 21 years. I replaced a number of the solenoids a few years ago, but now I'm running into a problem with a valve with a pinhole leak in the diaphragm. Am I correct that parts for these valves are NLA? What a pity, given that they've been so reliable! Not to mention that would mean having to replace them, which doesn't look like much fun. I'd sure like to find some NOS diaphragms sitting...
