LASCO 02-2229 Rubber 3/8-Inch Cone Washer, 4-Pack Includes (4) rubber stepped cone washers and ballcock nut Intended for use with old style corrugated and smooth metal supply lines Commonly used for connecting metal flex piping to faucets or toilets Fits 3/8-Inch OD Tubing (Outer Diameter) Use with brass friction ring for complete installation