York S1 025 27747 011 Rollout Switch Els PW 17895 The installer setup allows you The installer setup allows you to select between a standard 40 90°F range or a 50 99°F range to suit various heating equipment requirements The Belimo ZG NMSA 1 Shaft Extension is a critical accessory for HVAC contractors performing damper actuator retrofits or new installations where existing drive shafts are too short to reach the actuator clamp Durable Construction: Built to withstand the harsh thermal environment of the burner assembly for long term reliability The York S1 025 27747 011 Rollout Switch is a critical OEM replacement part designed for high performance gas furnace safety