1/2", 15mm etc. etc. - what do they all refer to? I have a new toilet cistern, with male plastic threaded fill inlet. The nut from a 15mm compression fitting screws on neatly. But it's obviously not a 15mm compression fitting, as standard 15mm pipe is too big to fit the inlet. Is it 1/2" female to 15mm compression converter fitting I need? What does the 1/2" refer to?
Dumbo confused by measurements
- Thread starter jlacd
- Start date
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1/2"" bsp it's the thread size 15mm is the outside of the copper pipe size 
it's a 1/2"" tap connector you need
or
it's a 1/2"" tap connector you need
or
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