The Montague 1287-4 is a brass male connector used in plumbing applications. Brass is a durable and corrosion-resistant material commonly used in plumbing fittings. This connector likely features male threads on one or both ends, allowing it to connect to other female-threaded fittings or components. https://partsfe.ca/1287-4-montague-adapter-716-tube-x-38-mpt