With Manual A/C Heater

The service access 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.

The high-side fitting is the largest. Special couplings are required for both the high-side and low-side service ports:
^ Rotunda R-134a Low-Side Quick Disconnect 176-R0036 or equivalent.
^ Rotunda R-134a High-Side Quick Disconnect 176-R0037 or equivalent.

Always install the A/C charging valve caps on the service access gauge port valves after servicing the refrigerant system.