Hi, Have bought new outside tap with 15mm speedfit . Thoght old black plastic pipe was 15mm. Not a bit of it: actually a tad under 18mm. What can I use to make this connection?
Philmac 3G fitting or UTC fitting maybe. https://www.philmac.co.uk/products/universal-transition-couplings/ https://www.philmac.co.uk/products/3g-metricimperial/ As above, photo would help.
Never been a fan of philmac fittings but the black pipe you are questioning is highly likely to be 3/8" black poly Try plumb Center for a plasson 3/8" imperial to male adapter and go from there.