Surface mount and recess mount housings are one-piece heavy wall cast aluminum (A356 alloy; <0.2% copper) construction, pretreated and powder coated. Recessed housings have 3/4" N.P.S.M. conduit entries on the bottom. Corrosion resistant, precise cast aluminum, low copper (A360 alloy, <0.6% copper) construction with decorative illuminated aperture.