Joval - Joval 12 in X 6 in X 7 in Pre-Fabricated Metal R6 Insulated End Tap Register Box
Master Flow 10 in. x 4 in. to 6 in. Universal Register Box RB10X4X6 - The Home Depot
Products | L7073, Cody Company, Cody Co 608PR88128 Insulated Register Box, 12 in L x 8 in W, Steel: Heating & Air Conditioning, Air Distribution, Grilles, Registers & Diffusers
Oval Register Boxes - Oval Pipe & Fittings - Ductwork - Sheetmetal - Air Distribution
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12 x 6 Register Box w Flange -Optional Collar - Budget Air Supply & Equipment
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14 In. X 6 In. X 8 In. 90 Degree Register Box With Flange - Walmart.com
IMPERIAL 12-in x 6-in x 6-in Galvanized Steel 90 Degree Register Duct Boot in the Duct Boots department at Lowes.com