Watertight Cable Outlet for 5/16" Cable Chrome Plated Brass. The chrome plated brass watertight cable outlet is designed for use with a 5/16 in. OD cable. Equipped with rubber grommet for watertight passage of cable. Base diameter: 1-1/4 in. Built from quality materials for long-lasting durability.Features:. Watertight cable outlet. Chrome plated brass. Diameter base: 1-1/4 in.. Built with quality materials