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

The kit provides the 1/4-inch Q

Can I use this for non-York equipment

How do I ensure accuracy during setup

Smith commercial units starting from serial #4015

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