"51" wrote in message
...
Having trouble fixing a leak so need to confirm a thread size.
a bottom entry float valve

http://www.andyplumb.co.uk/product.a...19&prodID=7472

Is it 1/2 " bsp or metric?

BSP is an ISO standard thread, which makes it officially a metric thread.
Most domestic tank and cistern fittings use 3/4" BSP, which is just over 1"
OD. If the one on that valve is 1/2", the thread OD would be about 3/4".

Colin Bignell