Pressure cap

[XK140]

Just giving this link because personally it took me a long time to track down the correct long reach cap....that is, one that also includes the upper rubber seal,so no messing around cutting up bits of old inner tube.
http://www.carbuildersolutions.com/uk/long-reach-r...

[XK140]

phillpot said:

Better in Stainless

Agreed...as long as that one is long reach,it doesn't say.

[XK140]

It's the cap inc.seal.
As a relative newcomer to the 'S' series I would say there is no can of worms whatsoever...this cap is on the swirl pot thing...a plain cap goes on the expansion tank,that's it.