15mm and 10mm x 15mm Street Elbow/Straight Chrome Pushfit Valve Reducing Elbow | eBay
SPARES2GO 15mm x 10mm Pushfit Radiator Valve Chrome Reducing Elbow Stem Compression (Pack of 2) : Amazon.co.uk: DIY & Tools
SPARES2GO 15mm x 10mm Pushfit Radiator Valve Chrome Reducing Elbow Stem Compression x 4 | DIY at B&Q
SharkBite 1/2-in Push-to-Connect x 1/2-in FNPT 90-Degree Female Elbow in the Push to Connect Fittings department at Lowes.com
Amazon.com: Danfoss RAS-C2 013G6007, Radiator Thermostat with Elbow Push Fitting - Maximum User Flexibility, for Use in 2-Pipe Central Domestic Heating Systems (White) : Automotive