This specific model is engineered for the 22-120 Pneumodulor socket

Once the temperature drops below the differential set point (typically below 180°F)

and larger 325-9 series vent-limited regulators

ensuring a perfect 1/4" fit

York S1-025-26392-012 Rollout Switch This specific model is engineeredThe York S1 025 26392 012 Rollout Switch is a critical safety component designed for precise thermal monitoring in high efficiency gas furnaces and HVAC systems. As a genuine OEM York replacement part, this SPST (Single Pole Single Throw) limit control ensures the burner circuit is interrupted if a flame rollout condition is detected. This specific model features an automatic reset configuration, calibrated to "open" and break the electrical circuit