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Thank you. So presumably, the o ring is part and parcel of the unit and cannot be replaced? So it will be a new unit then. Thanks again for your advice. :)

Sorry, but OH is adamant that it is the fact that it is because the plastic cap has come away and won't screw back on that is why the vent is leaking water. I don't know any different. Is this why it's leaking or is it because the whole vent isn't screwed home tightly enough. What is the cap...

OH is adamant that not any vent will do. I reckon he thinks I'm posting on an ebay forum! lol! But four months is a VERY short time isn't it.

Not sure I understand, twist what? The (soft) plastic cap has no thread on it and has sort of splayed at the bottom (It's like the valve cap on a tyre).

We have the above boiler which was working ok until Xmas last year, when we had to replace the automatic air vent which was crusty and leaking. The new one started leaking again, :x the little plastic cap is looking worn out. It hasn't been touched since the air vent was replaced. The old...