Fluidmaster toilet water supply connectors or water supply lines are built to last. Made of tough polymer core covered with braided stainless steel wire, these connectors exceed every code requirement for durability. They also have a large inside diameter for higher flow capacity. Guaranteed, no leaks. The "click" lets you know it's sealed. The only connector in the market available with CLICK SEAL technology. CLICK SEAL toilet connectors provide a guaranteed no leak seal and eliminates cross threading and stripping. No tools required for the CLICK SEAL end. Exceptional flexibility for fast, easy installation. Won't kink or crease, even in the tightest of spaces. 5 year warranty.