Fibox, the leading provider of non-metallic electrical enclosures, offers a comprehensive range of cUL/UL-listed NEMA 4X enclosures and NEMA 6P polycarbonate enclosures and junction boxes. House and protect power supplies, control panels, and other electrical equipment House electrical components such as on-off switches, receptacles, and dimmer knobs Enclose wiring for outlets and switches or block off unused components Add depth to an outlet box when there's not enough space for. Junction Box, NEMA 4X, Solid Screw Cover, 6 x 6 x 4 Inch, PVC/Gray Category: PVC / Polyester Screw Cover Junction Boxes Junction Box, NEMA 4X, Solid Screw Cover, 8 x 8 x 4 Inch, PVC/Gray Category: PVC / Polyester Screw Cover Junction Boxes Junction Box, NEMA 4X, Solid Screw Cover, 12 x 12 x 6 Inch. Design, fabrication and installation of electrical powerdistribution, explosion proof, extruded, metal, plastic, safety, audio and weatherproof enclosures. Our robust, non-metallic solutions are superior alternatives to traditional aluminum, fiberglass, or steel. Corrosion Resistant - Boxes & Brackets - The Home Depot Specials & OffersAppliancesBathBlinds & Window TreatmentsBuilding MaterialsLumber & CompositesCleaningHome DécorLightingDoors & WindowsElectricalFlooringHardwareHeating, Venting & CoolingKitchenGarden CenterOutdoorsPaintPlumbingHoliday. 3 is a safety rating for indoor and outdoor electrical enclosures that specifies a degree of protection against incidental contact, against the entry of solid objects (falling dirt, windblown dust) or water (snow, rain), and against exterior ice formation. 3X are for both indoor and outdoor use.