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Carlon® Non-metallic boxes
Carlon 1-Gang 8 cu. in. PVC Shallow Flanged Old Work Electrical Switch and Oulet Box B108R-UPC - The Home Depot
Newhouse Hardware 1-Gang PVC Old Work Electrical Outlet Box (48-Pack) | 14 cu. in. Plastic Junction Box for Switches, GFCI, or Duplex Receptacle Outlet | Old Work Electrical Box for Home Improvement :
Arlington ONE-BOX Single-Gang Outlet Box
How to Install an Old Work (Retrofit) Electrical Box
junction box - "Old Work" electrical box: should it be screwed into the stud? - Home Improvement Stack Exchange
Carlon Part # B120R - Carlon 1-Gang 20 Cu. In. Blue Pvc Old Work Electrical Switch And Outlet Box - Electrical Boxes - Home Depot Pro
Old Work Box, Single Gang, 20-cu. In., 4-1/8X2-5/16X5/8" Deep, Thomas & Betts | Walmart Canada