Smith 100208106 Front Header Gasket is a mandatory replacement item to ensure a gas-tight seal

allowing for high-density relay packaging in mechanical rooms or control panels

providing protection against dust and low-pressure water jets

while the gauge itself maintains a compact 1/4" NPT stem

Reznor 193809 Pressure Switch Els PW 17895 Smith 100208106 Front Header GasketThe Reznor 193809 Pressure Switch is a mission critical 0. 65" WC air pressure switch kit designed for precise combustion air monitoring in Reznor unit heaters. Calibrated to trigger at a 0. 65 inch water column setpoint, this HVAC induction fan safety switch ensures the inducer motor maintains the necessary vacuum pressure for safe flue gas venting before ignition. This replacement kit is the correct Reznor OEM part cross reference for legacy