How do I verify if the 1173838 is compatible with my current HK42FZ017 or similar older revision

By utilizing a 4-way pilot design

Enhanced Flame Sensing: The high-output thermopile delivers a stable millivolt signal to prevent premature gas valve closure

Direct OEM Compatibility: Engineered as a drop-in replacement for Weil-McLain 7121-5750 and JA1N074

Attempting to bore out the hub or force-fit it will compromise the balance and integrity of the assembly

Heat Controller R68CA0003 Limit Switch 340155-7024 How do I verify ifThe Heat Controller R68CA0003 Limit Switch is a critical HVAC safety control designed to prevent heat exchanger damage in gas fired furnaces and air handlers. This L170 40F limit switch features a 170? F trip point, automatically breaking the electrical circuit if internal plenum temperatures exceed safety thresholds to prevent overheating. Once the system cools to 40? F, the auto reset limit switch restores continuity, allowing the heating cycle to