AC Charge/Schrader Valve, High Side. See #14 (Red Arrow), Switch May Be Located On The Receiver Drier On Some MODELS, Otherwise Located On The High Pressure AC Hose (Sorry, No Illustration). FITS 1994-1996 XJS 4.0 & 6.0, 1995-1997 XJ6 XJR, 1994-1996 XJS, 1998-2003 XJ8 XJR & 1997-2006 XK8 XKR (MHD7372AA)