Got a call this moring from a customer that his system (one we didn't install) has about 20 broken heads. He tells me its the same heads he has sprayed wd-40 on and the water is coming out from the top of the heads. Nice!!!! So we go.... Indeed the water is coming from the wiper seals all RB's 5000. The heads aren't even coming up out of the ground. We check all the valves everything is open backflow preventor all is good. Lets take some pressure readings now. We got a whooping 37 psi and 7.75 gpm not good. I take a look at the nozzles now and see 5 rotors with #3 nozzles let me see 13.73gpm. The home owner tells me the system just stop working the other day!!!!! Installed 4 years ago!!!!! City water by the way.