Armstrong Fluid Technology 810120-003 Coupler 318973-401 reducing the risk of element

reducing the risk of element sag or cabinet hot spots

the flame sensor likely has soot buildup or an internal crack in the insulator

verify your specific boiler’s wiring schematic for its line voltage terminal configuration

The kit provides the 1/4-inch Q

Armstrong Fluid Technology 810120-003 Coupler 318973-401 reducing the risk of elementThe Armstrong Fluid Technology 810120 003 Coupler is a precision engineered OEM replacement part designed for high performance hydronic systems. Specifically manufactured for Armstrong H 51 and H 52 circulator pumps, this four spring type coupler facilitates efficient power transfer between the motor and the bearing assembly. Featuring a 1 2 inch x 1 2 inch shaft size and a robust cast iron construction, it is built to withstand the rigorous demands