Must be used in conjunctiıon with OS&Y valve.
(Water pumpingand suction lines, under wet alarm valves building entries etc.)
OS&Y rısıng stem valve monıtorıng key is a weather proof and tamper resistant switch for monitoring the position of the OS & Y valve .It is provided with dry contacts which will operate when the valve position is altered and activate the alarm unit. Ideal for indoor and outdoor use. UL LIST-FM certified