Marketing InformationThis supervisory tamper switch, model TS-OSY, is intended for use in fire service systems. The purpose is to sound an alarm when the OS and Y valve is closed, or the tamper switch is removed. The TS-OSY supervisory switch is UL Certified, Safety Signaling (Control No. 3L38), and installed on all OS and Y type valves that can be used to isolate the flow of water to any portion of the fire sprinkler system, where indicated on the drawings and plans and as required by applicable codes and standards. The supervisory switch is NEMA 4X and 6P rated and suitable for use indoors or outdoors. Fits TS-OSY models in sizes 2 1/2 to 12 IN. Includes installation instructions.