LASCO 02-2207 Rubber 7/16-Inch Cone Washer 4-Pack. Includes (4) rubber cone washers and 1/2-Inch nut. Intended for use with old style corrugated and smooth metal supply lines . Commonly used for connecting metal flex piping to faucets or toilets. Will accommodate and fit 7/16-Inch OD Tubing (Outer Diameter) . Use with brass friction ring for complete installation. Lead free kit.