Potter OSYSU-2eBayProduct Overview The Potter OSYSU Series Outside Screw & Yoke (OS&Y) Valve Supervisory Switch is designed to monitor the open position of OS&Y gate valves. Available in two models the OSYSU 1 with a single SPDT (Form C) contact and the OSYSU 2 with two SPDT (Form C) contacts, these switches provide reliable valve status monitoring for fire protection systems. The OSYSU mounts to most 2 to 12 (50300 mm) valves, with select models fitting valves as
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