Watts WP9S-16PB 1-Inch Stainless Steel Cinch Clamp for 1-Inch PEX Pipe, 10-Pack 1-Inch x 1-Inch 10/bag 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