The Danco friction ring is designed to be used for toilet or sink supply repair. The friction ring creates a leak proof seal with a washer at the water supply inlet. it is designed for use on faucets, sinks and toilet ball-cocks. Replacing a worn washer is an easy DIY project. New washers eliminate leaks which waste both water and energy and can damage floors.Use washer G-M,Prevents leaking and provides positive shutoff for your supply line