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Steel City 53151 1/2 3/4 Pre-Galvanized Steel Square Box Extension Ring with 1/2-Inch and 3/4-Inch Knockouts - Ring Terminals - Amazon.com
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Steel City 531511234UB 4" Square Extension Ring, 1-1/2" Deep, 1/2" & 3/4" Knockouts, 21.0"° | Cooper Electric
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RACO Steel New Work/Old Work Box Extender Electrical Box in the Electrical Boxes department at Lowes.com
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RACO 2-Gang Steel New Work/Old Work Box Extender Electrical Box in the Electrical Boxes department at Lowes.com
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RACO 8203 Electrical Box Extension Ring, 1 Gang, 22.5 Cu-in, 4 in L X W X 1-1/2 in D, Color - Electrical Boxes - Amazon.com
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Steel City 53151-1/2-3/4 4 x1-1/2 Inch Steel Square Extension Ring with 1/2 and 3/4 Inch Knockouts | Cooper Electric
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Appleton 40E12 :: 4" Octagon Box Extension Ring, 1-1/2" Deep, 1/2" KOs, Steel :: PLATT ELECTRIC SUPPLY
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