The Topaz Valve is a float operated water valve for use in automated filling of water troughs, storage tanks, cisterns, etc. The Valve is configured for above water or below water mounting. The Float operates a small pilot valve which in turn operates the main diaphragm valve. Topaz valves are a good choice when high flow, compact, robust, non corrosive construction and high level of adaptability are desired. Topaz Valves is available in sizes of 3/4" (NPT). Operating pressure is 5-100 psi. Maximum Temperature is 140 degrees (F). Topaz Valves are NSF 372 Certified for potable water systems. Topaz Valves have a patented 1/4 turn removable base for easy cleaning and servicing.