Armstrong International D503157 Air and Gas Vent Refrigerant the internal diaphragm is likely

the internal diaphragm is likely ruptured or worn and requires replacement with the D-251-6000

With a maximum operating pressure of 450 PSI (standard) or up to 700 PSI for R-410A applications

eliminating the need for a separate probe-type LWCO

Its slender body design allows for effortless installation with deep-socket wrenches in tight mechanical spaces

this model is designed for R-22

Armstrong International D503157 Air and Gas Vent Refrigerant the internal diaphragm is likelyThe Armstrong International D503157 Air and Gas Vent is a high performance Series 21AR Cast Iron Fixed Pivot Ball Float designed for the efficient removal of air and gases from pressurized liquid systems. Engineered with a 1 2" NPT connection and a precision 5 64" orifice, this unit is built to manage a maximum operating pressure of 133 PSI. It is technically identical to the 21 AR 1 2 133 model, providing a robust solution for preventing air binding