Only Fluidmaster has water supply connectors with CLICK SEAL. Click seal makes an audible sound when you are sealed and limits stripping and cross threading. The "click" lets you know it's sealed. Fluidmaster faucet water supply connectors are built to last. Made of a tough polymer core covered with braided stainless steel wire, these connectors exceed every code requirement in the book for durability. Fluidmaster offers a wide variety of types and sizes, perfect for your home improvement efforts. Featuring high flexibility for easy install, braided stainless steel for durability, and easy grip connectors.