replacing both 49L88 and 49L8801 part numbers without field modification

The tin-plated bulb and capillary resist corrosion in high-moisture environments

Its robust design minimizes calibration drift

Engineered for low-noise operation in noise-sensitive residential and commercial environments

Common Questions: What damper blade size is this clip compatible with

York S1-024-35261-000 Pressure Switch replacing both 49L88 and 49L8801The York S1 024 35261 000 Pressure Switch is a critical safety component designed for precise monitoring of combustion air and exhaust gas flow within high efficiency HVAC systems. This 1" WC SPNO (Single Pole Normally Open) switch is engineered to close on fall, ensuring that the inducer motor maintains proper static pressure before the ignition sequence initiates. As a direct OEM replacement part, this unit serves as the updated cross reference for