LASCO 02-3089 2-3/8-Inch ID by 1-7/16-Inch ID Rubber Mack Gasket for Lavatory Drains The product is 2-3/8x1-7/16Mack Washer Easy and simple use kit The product is manufactured in China Durable rubber construction Mack gasket Lavatory drain Pop up style, 2-3/8-Inch O.D x 1 7/16-Inch I.D For use with lavatory PO / CO plug drains