Thank you Simon - very useful info :-)
I'm in a quandry now - I know that my system leaks slowly, but I don't know where from. If it's either of these joints then re-using the 15 year old seals ain't going to help. The leak could be elsewhere though, I know. It could even be in the current condensor - I've no idea what condition it's in until I get the bumper off and take a look.
Hmmmm.
I shall sleep on it I think, and work out what to do.
One other thing - people have talked about lubricating the O-Rings with rubber grease. I'm guessing this may help to seal the joint. Where does one buy rubber grease from?
Thanks again!
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