The Fluidmaster B1T12CS Click Seal Toilet Connector is designed to be the fastest and easiest to install toilet supply line on the market. Click Seal makes an audible inchclick inch when the seal is secure, to help eliminate over-tightening and minimize cross threading and stripping. Offering a 12 inch length and fitting 3/8 In. Compression x 7/8 In. Ballcock fittings. Fluidmaster toilet water supply connectors are made to last with a tough polymer core covered with braided stainless steel wire, these connectors come with a 5 year warranty. Featuring exceptional flexibility for fast and easy installation, with easy to grip and durable nuts, one end click seal and the other a nickel plated brass hex nut. No tools are required for installation, and Fluidmaster toilet connectors won't kink or crease in the tightest spaces. Lead free and meeting all code requirements for flexible water connectors. Fluidmaster Click Seal the inchclick inch lets you know it's sealed.