York S1-026-34027-000 Roll Out Switch is the critical seal required

is the critical seal required for McDonnell & Miller 47 Series

this adapter features a 3/8" SAE flare connection by a 1/2" MPT (Male Pipe Thread)

the internal fiber gasket can be replaced if it becomes compressed or damaged

Standard service for VP513 and VP517 valves requires two spacers per valve

Can I bypass this rollout switch for troubleshooting

York S1-026-34027-000 Roll Out Switch is the critical seal requiredThe York S1 026 34027 000 Roll Out Switch is a critical furnace safety limit designed to detect abnormal combustion conditions. As a specialized bimetal flame rollout limit switch, it monitors the burner area for escaping flames or "rollout" caused by heat exchanger failure, restricted venting, or flue blockages. Rated for 300 degrees Fahrenheit, this manual reset switch terminates the electrical circuit to the gas valve when thermal thresholds are