Danco, Inc. 80410 Washer, for Use with American Standard Aqua Seal Faucets, Rubber, 1/2-Inch x 11/16-Inch N/A Imported Rubber construction for durability Compatible with American Standard aqua seal faucets Stem diaphragm helps stop drips 1/2 in. inside diameter with 11/16 in. outside diameter Rubber construction for durability Stem diaphragm helps stop drips 1/2 in. inside diameter with 11/16 in. outside diameter