4 Inch Round 1/2 Inch Deep Pan Box Extension Ring-5 per case - - Amazon.com
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Red Dot 4 Hole 1/2 In Round Box Extension | The Home Depot Canada
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RACO Silver Steel New Work/Old Work Standard Box Extender Ceiling Electrical Box in the Electrical Boxes department at Lowes.com
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Carlon 4 in. Blue Nonmetallic Round Plaster/Mud Ring for Electrical Ceiling Box A471RR
iMBAPrice BE1R 1-Gang 4.35-Inch x 1.5-Inch Plastic Electrical Ceiling Box Extender for 3.5" and 4" Round or Octagonal Boxes: Amazon.com: Tools & Home Improvement
Carlon 1-Gang 18 cu. in. Round Old Work Electrical Box B618RR
Box extender Electrical Boxes at Lowes.com
Ceiling box - Boxes & Brackets - Electrical Boxes, Conduit & Fittings - The Home Depot
Box extender Electrical Boxes at Lowes.com
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RACO Silver Steel New Work/Old Work Standard Box Extender Ceiling Electrical Box in the Electrical Boxes department at Lowes.com
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Hubbell-Raco 111 Extension Ring Ceiling Outlet Box, 11.8 Cu-in, 3-1/2 in Dia X 1-1/2 in D, 3-1/2" - Light Bulbs - Amazon.com
Arlington Industries Box Extender 2-pack BE1-2
Amazon.com: Arlington Industries Arlington BE1R Plastic 1-Gang Ceiling Box Extender 4.35 Inch x 1.5 Inch, Color : Everything Else
Eglo 7 Piece 62" Length Electrical Box Extension Set with Cover Plate | 88968A | Destination Lighting
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How to Extend Wiring in Ceiling or wall for Light Fixture Romex Install Junction J-box - YouTube