Rainbird HV NPT Non-Flow Control Valve, 1" 1 in. (26/34) female x female threaded plastic residential irrigation valve Eccentric diaphragm for smooth closing, less water hammer Compact design, 2.54 in. spin radius for tight installations (install more valves in a single valve box) Captive multi-drive screws for ease of access and faster bonnet removal Glass-filled polypropylene body for strength