DJC Supply Co. 4" x 4" x 3" PVC Plastic Junction Conduit Box with Pre Molded 3/4" & 1/2" Conduit Holes - - Amazon.com
Fielect 86 Type Wall Switch Box Deep Case Recessed Mount Backbox Protection Cover Waterproof Dustproof PVC Wall Switch Socket Box 3.35"×3.35"×1.57" Single Gang White 1pc - - Amazon.com