On Thursday 23 May 2013 11:57 Dave Baker wrote in uk.d-i-y:

I want to buy a hose pipe to attach to the outdoor tap at my new house.
Thread size measures up at about 30mm o/d and a tad less than 2mm pitch
which doesn't seem to be any normal BSP size. Is this a standard metric
thread for garden taps?

Usually 3/4" BSP but I have seen a 1" BSP - could that be yours?
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