Danco 38806B Faucet Washer, 5/16 in ID x 13/16 in OD Dia, 5/16 in Thick, Rubber, For: 3/8 in OD Tubing into Ballcock

The Danco cone washer is designed to be used for toilet or sink supply repair. The washer creates a leak-proof seal 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.