4x2 Inch Utility Size Single Gang Electrical Box, Drawn Construction, Outlet Box, Handy Box, Ten 1/2 Inch Knockouts, Raised Ground, 13 Cu. in. Capacity, 1-7/8" Deep, Galvanized Steel - Amazon.com
Newhouse Hardware 1-Gang PVC Old Work Electrical Outlet Box (1-Pack) | 14 cu. in. Plastic Junction Box for Switches, GFCI, or Duplex Receptacle Outlet | Electrical Box for Home Improvement - Amazon.com