New ProLock End Caps from John Guest®are available in 3/8- to 1-inch CTS sizes. Quick and easy to use, these end caps can act as emergency water stoppers and can be used for pressure testing rough-ins and temporarily capping off installations. Its body is manufactured from high quality engineered plastic allowing the black caps to be UV resistant outdoors as well. Suitable for use with copper, PEX or CPVC pipe, these products require no tools to make secure, lead-proof connections. Available for immediate sale, the new ProLock End Caps are also lead-free and carry a 25 year warranty against defect in materials or manufacturing.