Sigma Engineered Solutions 1-Gang Gray Metal Weatherproof New Work Standard Box Extender Exterior Electrical Box in the Electrical Boxes department at Lowes.com
Crouse-Hinds TP422 4" x 4" x 1-1/2" Steel Square Box Extension Ring | NorthEast Electrical
One Gang Weatherproof Boxes, Extension Rings and Covers... WP, WPCV, WPRE, WIU, & WPEXB Series - YouTube
Iberville 1/2" 1-Gang Plastic Box Extension | Home Hardware
Hubbell SBEXBAR Device/Electrical Box Extension, Depth Adjustable Up to 0.88-in, Mounting screws Included | Canadian Tire
Red Dot One gang die-cast aluminum extension ring with 4 holes | The Home Depot Canada
1/2" ReceptXtenders (one), Single Gang Receptacle Outlet Box Extender. UL Listed, Mud Ring by WGDepot, Outlet Boxes - Amazon Canada
1Gang Handy Box Extension 1-1/2" Deep 1/2" KO Square Corners [25]
Hubbell-Raco 5406-0 Weatherproof Extension Box, 1 Gang, 18.3 Cu-in X 4-1/2 in L X 2-3/4 in W X 1 in D, Outlet Boxes - Amazon Canada