Ford 2003 Mustang Workshop Manual page 3183

19D734)
6 19D702 A/C charging valve cap
The fitting is an integral part of the refrigeration line or component.
Special couplings are required for both the high side and low side service gauge ports.
A new Schrader-type valve core can be installed if the seal leaks.
Always install the A/C charging valve cap (19D702) on the service gauge port valves after
repairing the refrigerant system.