If you require a constant-on override

It uses an encapsulated mercury SPDT position switch mounted on a crank arm designed for a 1/2-inch horizontal damper shaft

Replacing worn pneumatic seals prevents premature diaphragm failure and ensures the unit operates within its original 15 to 25 psig control pressure specifications

Designed to provide a secure mechanical connection in high-demand HVACR environments

specifically replacing part numbers 20J9101 and 20516001

Resideo 3008 Pressure Switch Els PW 17895 If you require a constant-onThe Resideo 3008 Pressure Switch serves as a critical safety and operational component in pneumatic electric control systems, specifically engineered for low pressure monitoring and regulation. This single pole, double throw (SPDT) device is designed to facilitate precise electrical switching based on pneumatic signal variations within a 3 to 15 psi range. Contractors frequently specify the 3008 model for its reliability in HVACR sequences, where it