Originally Posted by scchang
Thanks for the info. Along the same lines, since you mentioned the back flow issue, I have a few sprinkler valves located underground in valve boxes. I read that these were supposed to be at least 6" above the highest sprinkler head. Do you know if this is a problem?
If you just have "in line" valves, there is suppossed to be a siphon break located at the connection betweeen the municipal supply and your sprinkler supply line. If you have individual valves with built in siphon breakers, they should all be located above ground to be functional. Here, it is 12" above the heads.