ProLock shut-off valves from John Guest USA are available in 1/2- or 3/4-inch copper tube size. Manufactured from engineered black thermoplastic, the shut-off valves are UV-resistant and safe to use outdoors. The shut-off valves have two interchangeable buttons for color-coding hot and cold-water applications. These fittings are suitable for use with copper, PEX or CPVC pipe. ProLock are lead-free and require no tools to make secure, leak-proof connections. 973-808-5600; www.johnguest.com.