Standard FLSR series fuses are designed with a rejection feature that fits Class R fuse holders perfectly

Direct OEM Integration: Exact fit for York air handlers and furnaces

it eliminates the calibration drift often found in universal aftermarket alternatives

Internal Bypass Protection: Optimizes hydraulic pressure during high-flow pump cycles

Rheem-Ruud 42-24166-81 Pressure Switch Els PW 17895 Standard FLSR series fuses areFor veteran HVAC technicians and service contractors, the Rheem Ruud 42 24166 81 Pressure Switch is the definitive OEM replacement for maintaining the safety loop in two stage gas furnaces. This dual pressure switch assembly is factory calibrated with precise setpoints of 0. 15" WC for low fire and 0. 30" WC for high fire operations, ensuring the inducer motor maintains the necessary static pressure for safe flue gas venting. Designed specifically for