[UPDATE] It turns out that it wasn't this expansion vessel (?) that was leaking, it was being dripped upon from above! (well, actually, from above and to the side; the drip was running down a pipe, then apparently *back up* a joint - which was so corroded it was acting like a sponge - and onto the vessel itself. It seems unlikely, but having fixed the drip above I see no more drips from the expansion vessel).
Ian
February 2009
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