314.28 Pull and Junction Boxes and Conduit Bodies. Straight Pulls.
4x2 Inch Utility Size Single Gang Electrical Box, Handy Box, Ten 1/2 Inch Knockouts, Raised Ground, 13 Cu. in. Capacity, 1-7/8" Deep, Galvanized Steel, Drawn Construction, Outlet Box, - Amazon.com
3" Schedule 40 LR Type Conduit Bodies and Junction Boxes
Sizing Junction Boxes | EC&M
314.28 Pull and Junction Boxes and Conduit Bodies. Angle Pulls, U Pulls and Splices.
Hubbell Wiring Systems S1FRPTJB SystemOne Fire-Rated Poke-Through Power Junction Box with 3/4" and 1" E.M.T Connector: Amazon.com: Tools & Home Improvement
Malleable Iron Angle Junction Box for BS4568 Conduit Manufacturers and Suppliers China - Wholesale Price - Topele
Junction Box Sizing Calculator
Sizing Junction Boxes | EC&M
5-Inch Steel Square Low Voltage Outlet Boxes | Eaton
Sizing Pull and Junction Boxes made Easy - YouTube