Was doing some reading over the weekend and came across a blurb on the Hunter site regarding the "diaphragm support ring" on automatic valves. This is the ring that snaps into the body ahead of the diaphragm assembly and supports the diaphragm when it is in a closed attitude. They state that their support ring has holes in it so water between the diaphragm and the ring will siphon out thus not creating a suction effect of the diaphragm sticking to the ring (especially after long periods on non-use) and not opening the valve when the solenoid is activated. I would imagine that this would not be something that we'd immediately recognize with a valve not actuating after a long period of non-use. Once we take the valve apart to investigate the situation we'd break the diaphragm off the ring and not even notice, thus correcting the situation.