Waterproof IP68 External Junction Box, 2 Way Plug Line M20 Coaxial Cable Connector Wire Range 5 to 15mm Outdoor External Electric Power Cord Boxes (Black) - Amazon.com
Junction Boxes, Enclosures & Joints | Electrical World
Carlon 6 in. x 6 in. x 4 in. Gray PVC Junction Box E987RR - The Home Depot