This fitting slips over a 1½" pipe and slips inside 2" pipe, making it easy to install and connect to other plumbing components. The integrated water stop helps prevent leaks and enables a 1½" light socket to thread into the face, making it a perfect solution for lighting installation. Additionally, this fitting improves the appearance of the light's niche, instead of the standard unsightly silver. It is made from engineered polymer and UV-resistant ABS material, making it durable and long-lasting. With this product, you can easily achieve a sleek and finished look for your swimming pool lighting installation.