This 18mm female water tap aerator is designed to replace faulty or corroded aerators in taps. It features a 6 L/min flow rate, helping to reduce unnecessary water consumption during activities like washing hands, brushing teeth, or shaving. The aerator is made with a Chrome Brass outer base and a plastic insert. It has an external diameter of 20mm and a height of 19mm. A gasket is included. Please check all dimensions and measuring pictures prior to purchase to avoid returns.