Bag of 2-15mm x 10mm Brass Compression Reducing Coupling (Known as 15mm Copper Pipe Fittings/Brass reducing Coupling/Compression Coupling Also Available in 8mm, 10mm, 12mm, 15mm, 22mm, 28mm)

Pegler Terrier Chrome-Plated Brass Push-Fit Reducing 90° Elbow F 10mm x M 15mm

Greened House 15mm to 10mm 90 Degree Elbow Radiator Valve Pipe Reducer (Pair) for Radiator & Towel Rail Valves Chrome 1/2" Compression Fit