USED Thermal Switch For Hot Start System, See Illustration #16, FITS 1992-1996 XJS With V12 5.3 or 6.0 From VIN 179737 On. Screw in male threads on one end and 2 male electrical connectors on other end. This flushes cool fuel through the fuel rail during a hot start It prevents hard starting due to vapor lock. NLA (DAC10335)