System Safety: Prevents catastrophic heat exchanger failure by instantly cutting the gas valve circuit if the supply plenum exceeds 200°F

"snapped" connection that simplifies field installation and service in tight mechanical spaces

it provides reliable psig (and kPa) readouts for main air pressure or pilot-operated output signals from pneumatic controllers

this hermetic sight glass provides reliable leak-free performance and clear visibility for CFC

The ceramic insulator includes a standard rib on the right edge

Lennox 12W53 Pressure Switch Els PW 17895 System Safety: Prevents catastrophic heatThe Lennox 12W53 Pressure Switch is a mission critical safety component engineered for HVAC draft verification in high efficiency gas furnaces. As an OEM Lennox replacement part, this switch is factory calibrated to actuate at 1. 52" WC (water column), ensuring the inducer motor maintains the precise static pressure required for safe combustion and proper venting. Designed with a durable SPST (Single Pole Single Throw) configuration, it prevents