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
PVC Junction Box - 4 x 4 x 2-JB442
IPEX 077659 4 x 4 x 2 Inch 26.5 In. NEMA 1/2/3R/4/4X/6/6P/12/13 PVC Junction Box with Gasket/External Mounting Feet | Cooper Electric
Cantex 4 in. x 4 in. x 2 in. Junction Box R5133705 - The Home Depot
Topaz 1221 Junction Box, PVC, Wall Mount, 4" x 4" x 2" : Junction Boxes - $16.26 EMI Supply, Inc
1 Gang Rectangular Electrical Junction Box Galvanized Steel 2x4 Inch