2-Gang 21 cu. in. Square Wall Box 521511234-50R - The Home Depot
GARVIN® 52171-1 52171-1 ME | Fromm
RACO 192 Electrical Box Square 4" X 1-1/2" 1900 Standard Metal 1/2" & 3/4" KOs | eBay
STL-CTY 52151V1/2-3/4 1900-BRACKET | Gordon Electric Supply, Inc.
2 Gang 4X4 Square Metal Box EMT Conduit Steel Junction Box with 1/2 and 3/4 Ko. - China Utility Box Electrical, Gang Box Electrical | Made-in-China.com
Steel City 1-Gang 4 in. New Work Metal Electrical Wall Box with Ground Bump 521511234GB-50R - The Home Depot
Raco Electrical H Box,4-11/16 in.,42.0 cu in 257H - Walmart.com
1900 4" Square Electric Box
Electrical Box, Square, 4 X 1-1/2 in.: Electrical Boxes: Amazon.com: Tools & Home Improvement
1900 Electrical Box: What is it (And How Did it Get its Name)? | Electrical4U
1900 Box (12) 1/2" Knock Out 1-1/2"Deep - TRISTATE LOW VOLTAGE SUPPLY
3 Raco 1900 Box Galvanized Steel 1 Gang Outlet Box Cover 4" x 4" #902C NEW | eBay
1900 Box with Drop Ceiling Supports 6 pack (SSB-1900) - Mercommbe