Replace the old worn-out valve diaphragm for the Orbit Anti-Siphon Valve with this kit. This anti-siphon valve repair kit has a maximum water pressure of 125 PSI. Simply remove the old diaphragm and replace it with this diaphragm replacement. This Orbit valve diaphragm fits anti-siphon valves in the 57200, 57300, and 57600 series, including Ace nos. 7117856 and 7122351. You no more have to buy a whole new anti-siphon valve or costly, time-consuming repairs when you have this Orbit diaphragm.