Reisdential system, 1" Hunter SRV valve and 9 six inch ajustable spray heads. The water just boils out of the heads and the popups don't come all the way up. I have changed the diaphram, problem still exists. There are no visable leaks that I can see that would cause a loss of pressure. This is on a weekly mowing customer and the landscape contractor who installed the system won't even take a look for another few weeks. I just overseeded with perennial rye grass, and it needs water soon. I only do minor sprinkler repair work but this has me stumped. Any help would be greatly appreciated, and thank you in advance.