The Compression 15mm x 12mm Reducing Sets CORS‑1512 are durable copper compression fittings designed to reduce 15 mm pipework down to 12 mm with ease. Perfect for hot and cold water systems, central heating, and general plumbing installations, these reducing sets provide secure, leak-proof joints without soldering. Engineered to British and European standards, they’re ideal for professional plumbers and DIY plumbing projects alike.