The Grohe 13954EN0 is an aerator which allows regulated control of the water flow. It is an M 22x1 model under the clas PCA flow, which has a flow rate of 2gpm at 50 psi. The thread is built internally. The SpeedClean technology allows the removal of limescale with just the swipe of a hand or the flick of a finger. It comes with the Infinity brushed nickel finish, creating a warm tone in your bathroom and excellently hides water spots. This finish keeps your faucet resistant to scratches and makes maintenance a casual task of the day. Grohe takes pride in their wide array of products, from parts to finishes. They are famed worldwide for fixtures that are not only stylish but are also efficient. Together with Grohe, let us continue to provide you with trustworthy and affordable products here at Plumbersstock.com.