"Really useful item, These elbows enable you to use a budget (15mm) TRV and lock-shield pair but then connect to 10mm plastic piping from behind the radiator. Makes a neat job. Only thing missing is that the description on the Screwfix website doesn't say that they are "15mm stem to 10mm pushfit" elbows, I had to glean that information from another review. Will definitely use again."
"This allows the plastic 10mm pipes to come out of the wall behind a radiator and dive directly into the valve. Combined with a manifold this allows all the radiators on a single floor to be installed in a few hours."
"The spigot fits a standard 15mm radiator valve so effectively it converts the valve to a 10mm valve. Makes a neat job as you can have 10mm plastic pipe coming out of the wall directly into this chrome fitting"