you must use the 10123531 or an identical 325F rated switch as specified by the manufacturer's data plate

please consult the specific valve rebuild kit documentation to ensure proper fitment

As a direct replacement for S1-029-20423-043

5" globe valves

York S1-025-26392-010 Rollout Switch you must use the 10123531The York S1 025 26392 010 Rollout Switch is a critical safety component designed for heat exchanger monitoring in gas fired heating systems. This SPST furnace rollout switch is engineered to interrupt the burner circuit when it detects excessive temperatures caused by poor drafting or flame rollout conditions. Rated with a 145 degree F open temperature and a 105 degree F reset temperature, this switch provides precise thermal protection. Unlike manual