If you have CPVC (plastic) or steel pipes, add tee fittings made of the same material. If you don’t want to solder, you can cut the copper water pipe and install a 5/8-in. O.D. compression tee ...

A shutoff valve connects to copper plumbing pipes in one of two ways: Compression fitting; Sweat fitting. Identify the connection type used in your home by referring to the photos below.