Roomy interiors - deep body cavity provides increased volume allowing higher wiring capacity|Smooth, rounded integral bushing in each hub protects conductor insulation|Accurately tapped, tapered threads for tight, rigid joints and excellent ground continuity|Completely interchangeable with Crouse-Hinds Mark 9 bodies, gaskets and covers|Aluminum UNILETS produced from a high strength copper free aluminum alloy, for light weight and high corrosion resistance|FM9 covers with integral gasket are approved for use in wet locations|Covers are domed for extra wiring space|Smooth hub bushings and cover openings protect conductor insulation|Smooth hub openings allow easy conduit joining|Stainless steel pan head cover screws secure cover to body and provide superior screwdriver seating and torque|Hub size, body style, compliance data, maximum wire number/size and cubic capacity molded into body|Seven body style|Cover screws are captive to prevent loss in sizes