Specification: Material: Brass external diameter size:16/18/20/22/24mm inner diameter size:16/18/20/22/24mm Easy to install with less complicated parts to reduce installation time. This tap aerator is designed to cut down on unnecessary water consumption from your taps Saves water and energy,Provides an even water flow Suitable for home,office,school,public places use Package Included: 1pcs x Thread Adapter 2pcsx Gasket Features: Made of high quality copper, plating surface, durable. Offers a quick connection. Prevent splashing. Reduces tap noise. Water and Energy Savings of up to 70% . Easy installation. Suitable for bathroom, kitchen, garden supply and so on. Water Filter Adapter only,other accessories demo in the picture is not included. Note: 1. There is a 2-3% difference according to manual measurement. Please check the size carefully before you buy the item. 2. Please note that a slight color difference should be acceptable due to the light and screen.