Armstrong Fluid Technology 810120-003 Coupler 318973-401 The kit provides the 1/4-inch

The kit provides the 1/4-inch Q

reducing the risk of element sag or cabinet hot spots

allowing for field-adjustable flow limiting

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

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

Armstrong Fluid Technology 810120-003 Coupler 318973-401 The kit provides the 1/4-inchThe 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