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The NIBCO® PEX copper crimp ring is designed for use with NIBCO® PEX in potable water and radiant heating systems. The precision formed crimp ring is made of wrot copper with a black oxide coating. It fits over PEX tubing and the ribs of the insert fitting to seal the tubing and fitting together when properly crimped. Please refer to NIBCO® technical data sheets and catalogs for engineering and installation information.