Plumb Pak PP800-5 Faucet Aerator, 5/16-27 x 55/64-27 Male x Female Thread, Plastic, White Application: For use on standard kitchen faucets with inside or outside thread Dimensions: 2-5/8 in W x 3-3/4 in H Material: Plastic White plastic for use on standard kitchen faucets with inside or outside threads 55/64-27 female thread with 15/16-27 thread male adapter. Turn off water supply leading to faucet Remove old aerator Use both washers on faucets with inside threads Use only the thin washer on faucets with outside threads Finish White Thread Type Dual Thread Size 15/16" x 55/64" Number in Package 1 pk Packaging Type Boxed Each Weight 0.100 LB Product Type Faucet Aerator Material Plastic Dimensions 2-5/8 in W x 3-3/4 in H Application For use on standard kitchen faucets with inside or outside thread Color White Nominal Size 5/16-27 x 55/64-27 Connection Type Male x Female Thread Weight 0.11 lbs. Run water to test for leaks