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
How to Size a Junction Box | Polycase
Homeowners Ask: Are Junction Boxes Necessary?
Gratury Junction Box, IP67 Waterproof Plastic Enclosure for Electrical Project, Hinged Grey Cover, Includes Mounting Plate and Wall Bracket 220×170×110mm (8.6"×6.7"×4.3") - Amazon.com
DIECAST ALUMINIUM TERMINAL JUNCTION BOX - TMA series | PRODUCTS | TAKACHI - Manufacturer of electronics enclosures and industrial enclosures
Cantex 4 in. x 4 in. x 4 in. Junction Box R5133709 - The Home Depot