You guys may already be aware but Weathermatic had a bad [long] run of square solenoids. We were getting numerous failures on solenoids and WM just stepped up with a replacement program. From what we are seeing, years 2003 and 2004 are the in the scope. Contact your rep if you are getting failures on installs during that time. Good thing for RainMaster controllers. We would be waiting for the lawn crews to tell us something failed!