Originally Posted by Robbo D

I didn’t know there was a valve in there until a couple of days ago when I came across that thread. I couldn’t see the logic in the way it was fitted as it stops anything leaving the filler tube. I couldn’t pull mine out so put a drill through it after stuffing a rag in the filler pipe to catch any bits. I also enlarged the hole in the banjo bolt. Definitely bleeds a lot better now with no air in the central filling pipe or the coolant tank on the inner wing.
Rob.