"A very useful item when connecting 15mm compression fittings to 10mm copper or plastic pipe.
I used them to insert cheap 15mm full-bore service valves into my 10mm central heating drops. This method gives absolutely no flow restriction, as using 10mm valves might, and enables individual radiators to be easily drained and removed without a full system drain.
It’s not really a ‘straight reducer’ – you obviously can’t connect pipe to both ends – so they so should perhaps more correctly be called a fitting reducer.
See also 'JG Speedfit 10x15 Elbow ' if you prefer a bent one."
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Review 3 for JG Speedfit PEM061510WP Straight Reducer 15 x 10mm
"These come in handy when you're working with 10mm pipe and need to use all the 15mm fittings. The pushfit end is 10mm and the pipe end is 15mm. I used them to reduce down from 15mm monobloc tap tails (84084) and also with 15mm emergency shut of taps (13133)."