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Amazon.com: Steel City 55151-1/2-25 4-Inch Diameter 1-1/2-Inch Deep 15.8-Cubic Inch Pre- Galvanized Steel Octagon Box Extension Ring : Industrial & Scientific
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4 in. Square Extension Ring, Drawn, 1-1/2 in. Deep with Twelve 1/2 in. KO's: Electrical Boxes: Amazon.com: Tools & Home Improvement
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Raco 111 3-1/2" Octagon Extension Ring: Amazon.com: Industrial & Scientific
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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
