NIBCO® PEX fittings are lightweight, easy to install and maintenance-free. Joining can be accomplished with NIBCO copper crimp ring, copper sleeves, or stainless steel sleeves. The NIBCO® PEX system requires fewer fittings than traditional rigid plumbing systems resulting in fewer potential leak paths. NIBCO® PEX tubing, fittings, valves, and manifolds are designed to be used as a complete system, and are backed by a NIBCO INC. limited warranty.