this part is the primary solution for resolving "no-ignition" lockout codes or inconsistent flame-sense signals that plague older heating cycles

Non-Stick PTFE Disc: Engineered to eliminate the common issue of seat-sticking

ensuring exact physical fitment and electrical calibration for wall-mount units

it enters a lockout

including VAV units and small air handlers requiring a 120V power input

Hydrotherm BM-3355 Aeroquip Coupling 321894-706 this part is the primaryThe Hydrotherm BM 3355 is a high performance 3 inch Aeroquip coupling engineered specifically for heavy duty HVACR applications where fluid integrity is non negotiable. Designed for seamless integration into hydronic systems, including chillers, boilers, and industrial cooling towers, this quick connect coupling minimizes pressure drops and prevents fluid loss during maintenance cycles. Its leak proof design and high flow capacity ensure that your