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Steel-City 59361-1/2 4" x 2-1/8" x 1-7/8" Steel Handy/Utility Box Extension Ring, 13 cu.in. | Cooper Electric
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Steel City® SBEX Drawn Style Switch Box Extension Ring, 1 Gang, 3 in L x 3 in W x 7/8 in D, Steel | SMC
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TayMac Corp SE450S 4 1/2 Inch Hole Rectangle Box Extension Ring | Quality Electrical Distribution (QED)
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Raco 653 4" x 2" Handy Box Extension, 1-1/2" Deep, 1/2" End Knockouts, Welded | World Electric Supply
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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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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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