Orbit WaterMaster Underground 53067 Actuator Rebuild Kit, 3/4-Inch and 1-Inch Reinforced diaphragms for 3/4-inch. and 1-inch. actuators For orbit (57034, 57035, 57065, 57066), champion (cl-075, cl-100, aa-075, aa-100), rainbird/lawnlife (ea075b, ea100b), superior (200, 300, 800), and hydro-rain (57130, 57131) Durable, long-lasting washer and gaskets High-quality construction For outdoor use with cold water only