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Got it now. Thanks.

Thanks. The existing one is like a dust cap but it has a small hole formed on the side near the top. I'll try my car one. It is leaking but would have thought that if a replacement one was left loose then it would keep leaking??

I need to replace my auto air valve cap on my Baxi 133 HE plus. The black plastic cap. Can I get this on it's own for a few pence and if so where from. I am currently being told that I have to buy the whole auto air vent unit for £16. Thanks