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What is a back box?
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Niglon Metal Double 2 Gang Socket Back Box 47mm
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2 GANG SURFACE MOUNTED PATTRESS ELECTRICAL DOUBLE SOCKET BACK BOX, 47MM, WHITE | eBay
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25 mm Back Boxes | Wiring Accessories | Screwfix
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Dry Lining Back Box Flush Wall Pattress Double 2 Gang Electrical Socket Switch | eBay
