Watts P-372 3/8-Inch Stainless Steel Cinch Clamp for 3/8-Inch PEX Pipe, 10-Pack 3/8-Inch stainless steel Cinch Clamp Interlocking ring that forms a complete 360-Degree watertight seal Made of corrosion-resistant annealed 304 stainless steel Connection can be verified visually-tab of Cinch Clamp is "pinched" Meets ASTM F-2098