Orbit introduces this WaterMaster sprinkler diaphragm which is the perfect replacement for Orbit Jar-top sprinkler valves. Made of Santoprene thermoplastic, this sprinkler part is enduring. High-quality molded construction makes it highly reliable. The irrigation system part has a maximum water pressure of 125 PSI. Easy to use, this diaphragm connects sprinkler timers to valves. This Orbit sprinkler valve diagram is ideal for outdoor use with cold water only.