External Stopends are used to cap off the gutter at the end of the run. The are called external because they fit over the outside of the gutter profile.Our steel gutter stop ends feature a rubber seal and are installed by pressing or tapping the stop end in place using a soft faced hammer. We recommend using a small bead of silicon around the inside of the gutter at the joint. The rear top tab should be bent around the back of the gutter.