this valve is factory set at a 30 PSI relief pressure

Common Questions How do I install the A-421 for the most accurate reading

Are any additional gaskets or mounting hardware required for installation

This HVAC pressure sensor is a robust solution for maintaining system efficiency and protecting critical equipment from pressure fluctuations

York 028-11977-000 O-Ring 319848-301 this valve is factory setThe York 028 11977 000 O Ring is a precision engineered neoprene seal designed for high performance HVACR applications, specifically within York chiller systems and industrial liquid cooled units. Constructed from high grade chloroprene, this 1 inch OEM replacement part provides superior resistance to refrigerants, compressor oils, and common chemical solvents found in heavy duty HVAC environments. Its mechanical properties ensure a robust airtight