This part is a 1 3/4" Rotolock nut

As a furnace safety switch

Tripping is usually indicative of a restricted flue

or a complete system lockout during the startup sequence

Whether you are performing a routine HVAC valve repair or addressing a stem leak

Amana-Goodman B1370154 Rollout Switch This part is a 1The Amana Goodman B1370154 Rollout Switch is a critical safety component designed for high limit thermal protection in gas furnace heating systems. Engineered as a manual reset rollout switch, this SPST (Single Pole Single Throw) device is calibrated to open the circuit at a fixed 350 degrees Fahrenheit. This prevents continued operation if a flame rollout condition occurs, protecting the heat exchanger and surrounding components from excessive