Corrosion Resistant: High-quality galvanized steel resists moisture and heat cycles common in high-efficiency furnace environments

the X9117B6B is the correct internal replacement

Designed with 7/8" ODF sweat connections (solder)

Adjustable Differential: Field-adjustable 5°F to 45°F range provides granular control over system staging

and springs required for a full internal overhaul

Utica-Dunkirk 40154B008 Limit Switch Els PW 29614 Corrosion Resistant: High-quality galvanized steelThe 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