Hey, mrfixit: Thought I'd update you on my progress finding Orbit parts. I have not found a single store in San Diego that carries Orbit parts or will order them, and I didn't want to try to sort through the other parts to get the right ones. But actually, that is good news. Because when I called Orbit to order parts, they sent them to me for free! Amazing. This sprinkler system was here when I bought this place in 05, but the previous owners installed it sometime after their purchase in 01, so Orbit decided it was still under warranty. Cool, huh?
They sent me, among other parts, valve seal carriers (because the anti-siphon part of the valve leaks). Now I just have to figure out how to get the lid off. (I started another topic to ask for help before I found this old one ... ) Apparently I'm supposed to be able to just unscrew it like a jar lid, but I can't budge it. It's plastic. Do I get a big ol channel lock pliers and grab it and turn? I don't want to break something ...