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4" Square Conduit Boxes 4-11/16" Conduit Boxes Conduit Body Electrical Boxes & Covers Handy Boxes Electrical Boxes & Covers Masonry Electrical Boxes & Covers Multi-Gang Electrical Boxes & Covers Octagon & Round   3-1/2" Octagon Boxes & Covers   4" Octagon & Round Box Covers 4" Octagon Boxes 1-1/2" Deep   4" Octagon Boxes 2-1/8" Deep   4" Octagon Ceiling Fan Boxes   4" Octagon Extension Rings 1-1/2" Deep   4" Octagon Plenum Boxes & Covers   4" Octagon Swivel Fixture Hangers   5" Round Ceiling Blanks   Adjustable Bar Hangers   Concrete Box Plates   Kwik Hang swivel Fixture Hangers   Octagon Concrete Rings   Round Ceiling Plates & Fan Boxes Electrical Boxes & Covers Stainless Steel Electrical Boxes & Covers Switch Boxes Electrical Boxes Plastic Fasteners, Hangers & Clamps Fire Alarm / Emergency Boxes & Covers Fittings, Hubs & Bushings Fixture Whips & Grips GFCI--Ground Fault Circuit Interrupters Grounding Products Lighting & Lamps & CFL Bulbs Service Entrance Products Switches, Devices & Receptacles Tools & Install Accessories Wall Plates Weatherproof Boxes & Covers Aerial Drop Wire Hardware Beam Clamps Bridle Rings Bulk Wire & Cable Cable Management Distribution Rings Fire Prevention Products J-Hooks Jacks, Face Plates & Bezels Patch Cables Rope, Twine & Pulling Tape   Electrical Boxes & Covers Octagon & Round: 4" Octagon Boxes 1-1/2" Deep 4" Octagon, 1/2" & 3/4" Conduit Knockouts, Electrical Box: 1-1/2" Depth Octagon electrical boxes are installed in walls for light fixtures and ceilings for fans as well as light fixtures. Add an extension ring to increase your cubic inch capacity of the box. Depth: 1-1/2” Knockout Sides: (2) 1/2” & (2) 3/4” Knockout Bottom: (3) 1/2” & (2) 3/4” Features: Conduit Knockouts Material: Steel . Call for volume discounts. 54151-S Call 847-455-0188 for details on volume discounts.