The McAlpine S13 is a compression ring that is designed for use with imperial copper pipes in plumbing installations. It is a small but important component that is used to create a watertight seal between the copper pipe and a compression fitting. The S13 compression ring is made from high-quality materials, ensuring that it is strong and durable enough to withstand the rigors of plumbing installations. It is designed to be easy to install, and can be quickly and securely fitted onto a copper pipe using standard plumbing tools. The McAlpine S13 compression ring is suitable for use with a range of different plumbing systems, including those that use copper pipes as part of their construction. It is commonly used in both residential and commercial plumbing installations, and is a reliable and cost-effective solution for creating a secure and watertight seal between copper pipes and compression fittings. Overall, the McAlpine S13 compression ring is an essential component for any plumbing installation that uses imperial copper pipes. Its high-quality construction and ease of use make it a popular choice among plumbers and DIY enthusiasts alike. Available in 1.25" and 1.5" sizes

It is designed and manufactured by McAlpine, a UK-based company that specializes in plumbing products.

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