This 10-pack of Compression Reducing Couplings is vital for adapting pipe sizes in plumbing systems. Designed to join a larger 22mm pipe to a smaller 15mm pipe (copper or stainless steel) in a straight line, these reducing fittings ensure a smooth transition of flow. The compression mechanism creates a quick, secure, and leak-free seal without the need for heat or soldering. Essential for managing flow rate changes in domestic central heating and water pipe installations. A reliable, bulk solution for professional pipe diameter reduction.