Service Gauge Port Valves

The high side fitting is the largest. Special couplings are required to connect service equipment to both the high side and low side service ports. Refer to Special Service Equipment.
^ Quick disconnects must be used to connect a manifold gauge set to the system.
^ Always install the A/C charging valve cap on the service access gauge port valves after servicing the refrigerant system.

The service gauge port valves are either a one-piece or two-piece design:




^ In the two-piece design, the aluminum top portion of the valve is threaded to the bottom port and sealed with an O-ring seal. The valve seal is an integral part of the aluminum fitting piece which must be replaced if the seal leaks.




^ In the one-piece design, the valve is an integral part of the refrigeration line or component. The Schrader-type valve core can be replaced if the seal leaks.