this switch is a direct-fit for various OEM board-mount configurations

High Current Capacity: Rated for a 40-amp full load amperage (FLA)

and mixed air sensing

The Watts 0887709 is the vent float kit only

Spence uses a color-coding system for their pilot springs

Miscellaneous Product TS-470 Switch Els PW 17895 this switch is a direct-fitThe TS 470 Damper Position Switch provides open or closed position indication for compatible HVAC dampers and control assemblies. It uses an encapsulated mercury SPDT position switch mounted on a crank arm designed for a 1 2 inch horizontal damper shaft. This HVAC damper end switch changes contact state as the shaft rotates, allowing a building automation system, control panel, relay circuit, or other compatible equipment to confirm damper position.