The NIBCO® PEX stainless steel sleeve is designed for use with NIBCO® PEX in potable water and radiant heating systems. The precision formed sleeve is made of stainless steel. It fits over PEX tubing and located over the ribs of the insert fitting to seal the tubing and fitting together when properly crimped. The sleeve features a positive stop and visual locator port that ensure proper placement on the pipe. 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.