Carlon 1-Gang 14 cu. in. PVC Old Work Electrical Switch and Outlet Box B114RB - The Home Depot
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DJC Supply Co. 4" x 4" x 3" PVC Plastic Junction Conduit Box with Pre Molded 3/4" & 1/2" Conduit Holes, Easy to knock out covers, Metal screws - Amazon.com
CARLON 1-Gang Blue Plastic New Work Standard Switch/Outlet Wall Electrical Box at Lowes.com
Buy Wholesale China 200x200x80mm Ip65 Pvc Plastic Enclosure Electronic Box Waterproof Electric Junction Box & Junction Box at USD 2.4 | Global Sources