The McAlpine T13 is a compression ring that is designed for use with imperial copper pipes. The compression ring is used to create a watertight seal between the pipe and a compression fitting. The T13 compression ring is made of brass, which is a durable and corrosion-resistant material that is commonly used in plumbing applications. To use the T13 compression ring, the ring is placed over the end of the copper pipe, and a compression fitting is then inserted onto the pipe. The compression fitting typically includes a nut and a ferrule, which are tightened down onto the compression ring to create a tight seal. This compression fitting is commonly used in a variety of plumbing applications, such as for connecting pipes to faucets or other fixtures. It's important to note that the T13 compression ring is designed specifically for use with imperial copper pipes, which have a different size and thickness than metric copper pipes. Therefore, it's important to ensure that you are using the correct size and type of compression ring for your specific plumbing application. 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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