Faucet connector nut clicks and stops tightening when connector has achieved a good seal. Click seal technology prevents over tightening and cracking of connector nut and faucet shank. Stainless steel braiding provides maximum protection against bursting. • 3/8" compression x 1/2" female iron pipe x 16"• Click seal connectors provide an audible click when the supply line is adequately tightened• Won''t kink or crease even in the tightest of spaces • Exceptional flexibility for fast easy installation• Exceeds all code requirements for flexible water connectors.