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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
Steel City 1-Gang 4 in. 2-1/8 in. D New Work Metal Utility Box 5837112-25R - The Home Depot
RACO 1-Gang Gray Metal New Work/Old Work Deep Switch/Outlet Ceiling/Wall Electrical Box at Lowes.com
Hubbell WIRING660 662077 Handy Box with Single Gang, Six 1/2" Knockouts and 1-7/8" Deep: Electrical Boxes: Amazon.com: Tools & Home Improvement
Metal Electrical Boxes at Lowes.com
Metal Single Gang Switch Box with NM Clamps | City Mill
Steel City CXWV 18cu.in Gangable Steel Switch Box with Clamp | Cooper Electric