Mueller A17921 Manifold 323080-701 Reliable Fail-Safe Operation: The normally

Reliable Fail-Safe Operation: The normally open configuration ensures the valve remains open during power loss for critical bypass or drainage needs

and 325-9 Series regulators

This 1/2" NPT zone valve is engineered as a two-way normally closed component

though we recommend verifying if your existing knob matches the 13/16" stem length or if a new dial kit is required for your specific faceplate

this unit operates at 208-230Vac and maintains a consistent 1050 RPM for stable static pressure performance

Mueller A17921 Manifold 323080-701 Reliable Fail-Safe Operation: The normallyThe 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