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4 gang switch box installation for "new work" - YouTube
2-1/8 Inch Deep Four Gang Multi Device Switch Box-1 per case, Outlet Boxes - Amazon Canada
Hubbell-Raco 953 (4) Gang 1-5/8-Inch Deep Welded Gang Electrical Box with (16) Concentric 1/2-Inch and 3/4-Inch Knockouts : Amazon.ca: Tools & Home Improvement
electrical - Wiring 4 gang box - Home Improvement Stack Exchange