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Steel City 4 in. 1-1/2 in. New Work Deep Pre-Galvanized Metal Octagon Electrical Box Extension Ring 551511234-25R - The Home Depot
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Hubbell-Raco 127 Octagon Box, 4-Inch, Raised Ground 1-1/2-Inch Deep 1/2-Inch and 3/4-Inch Side Knockouts, 4 in, Gray Finish - Electrical Boxes - Amazon.com
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STEEL CITY 1-Gang Round Metal Electrical Box Cover in the Electrical Box Covers department at Lowes.com
RACO Electrical Box, Octagon, Number of Gangs 2, Galvanized Steel, 1 1/2 in Nominal Depth - 6XC79|127 - Grainger
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