this genuine part ensures dimensional accuracy and structural integrity where generic aftermarket wheels often fail to meet factory airflow curves

this component ensures consistent burner light-off in gas-fired equipment

and GV series boilers

and geothermal applications

Mueller A17921 Manifold 321042-401 this genuine part ensures dimensionalThe Mueller A17921 ReliefMaster is a heavy duty change over manifold engineered for high demand industrial and commercial refrigeration applications. This HVACR manifold features a 1 2" NPTFE (National Pipe Thread Fuel Extended) inlet and 1 2" NPTFI (National Pipe Thread Fuel Injection) outlets, providing a secure, leak proof transition for dual relief valve setups. With a design pressure (MAP) of 700 psig and a broad operating temperature range of