Red Dot CKMU Outlet Box While-In-Use Cover, Universal, 1 Gang, 3-1/4-Inch Inside Depth, Powder Coated Alloy A360 copper-free aluminum provides increased corrosion resistance Die cast metal construction provides long-lasting durability Combination box or device-mounting design provides flexibility in installation NEMA 3R rating ensures protection against falling rain, sleet and external ice formation when used with appropriate device boxes Clear UL and CSA markings speed approval by inspectors