Flush Mounting in Concrete or Surface MountingNEMA 4 - NEMA 3R - Complies with U/L Std. 50Cast Iron - Hot Dipped GalvanizedThird Party Certification: UL File E 189027Standard Construction:1.Box and plain cover of cast iron.2.Stainless steel machine screws.3.Neoprene gasket.Available Extras:1.Drilling only. Drilling and tapping.2.Bosses for five threads. Special gaskets.3.Mounting lugs.4.Plain brass or checkered bronze covers.5.Interior mounting buttons tapped blind.6.Galvanized steel checkered cover available if specified by adding the suffix "SC" for "H-5 Pedestrian, or "SCV" for "H-20 Vehicle".All boxes that are made in cast iron can also be made in cast aluminum – just add “AL” to the end of the part number to indicate cast aluminum.