Carlon 1-Gang 18 cu. in. PVC Round Old Work Electrical Box B618RR - The Home Depot
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Junction Box Outdoor Waterproof Electrical Box, 2 Way Plug Line Plastic External Junction Box, M25 Waterproof Electrical Box, Electric Power Cord Boxes Suitable for Outdoor Lights, Landscape Lighting - Amazon.com
11 Types of Electrical Boxes and How to Choose One