For easier installation, be sure to also buy pipe thread sealant formulated for plastic. Installing a valve in a plastic drain is usually a quick, hassle-free job. But cast iron drains can be ...

Most contain a saddle valve (which doesn’t meet plumbing ... If you don’t want to solder, you can cut the copper water pipe and install a 5/8-in. O.D. compression tee instead (just don ...