the X9117B6B is the correct internal replacement

Engineered for high-reliability intermittent pilot ignition sequences

utilizing R-410A refrigerant to deliver a nominal cooling capacity of 168

Rugged Construction: Built for high-exposure environments

Utica-Dunkirk 40154B008 Limit Switch Els PW 29614 the X9117B6B is the correctThe Utica Dunkirk 40154B008 Limit Switch is a critical high limit safety control designed for specific residential and commercial hydronic heating systems. Rated for an operating range of 170 200F, this automatic reset limit switch monitors heat exchanger temperatures to prevent thermal runaway and equipment damage. As a genuine OEM Utica boiler replacement part, it ensures precise calibration within the aquastat control circuit, maintaining system