3/4″ Stainless Steel Crimp Style Sleeve for PEX.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. Please refer to NIBCO technical data sheets and catalogs for engineering and installation information.