York S1-024-39706-000 Switch 320819-301 Broad Compatibility: Functions as a

Broad Compatibility: Functions as a direct drop-in replacement for legacy BASO H91RA-4 and H91RA-1 valves

Common failure points include heavy rust from condensate leaks or warping due to excessive heat exposure near the heat exchanger interface

sharing the same technical specifications and 6-tube dimensions for a "drop-in" installation

When should I use a rebuild kit instead of replacing the entire valve

providing a perfect fit for models A2 through B3

York S1-024-39706-000 Switch 320819-301 Broad Compatibility: Functions as aThe York S1 024 39706 000 Switch is a critical safety component engineered for precise furnace air pressure switch monitoring in residential and light commercial equipment. This OEM York replacement part features a Single Pole Normally Open (SPNO) contact configuration and is factory calibrated to actuate at 0. 10" WC on fall. Designed for high efficiency natural gas furnaces, including specific models in the TM9E series, this 0. 10" WC pressure