8461 x 1. A new water capillary-bulb cap double male adaptor which inserts into the inlet Manifold or thermosat housing on the XK120. This is a correct inner bore diameter for the capillary bulb. Made in brass, it receives the sealing, cap-nut which is fitted onto the end of the temperature gauge bulb. The cap-nut is captive, as it is pre-fitted onto the delicate, gas filled capillary tube before the  temp. sender bulb is braised on when the gauge is manufactured / rebuilt. Original Number C9621.

If you have suffered bad corrosion to your manifold or temp casting threads, and the adaptor leaks, we suggest you try using our taper thread version to rectify the sealing problem.  SEE : 8460