ReceptXtenders 2-Gang Black PVC Weatherproof New Work/Old Work Standard Box Extender Wall Electrical Box in the Electrical Boxes department at Lowes.com
Carlon Multi-Gang Non-Metallic Electrical Box Extender (2-Pack) B1MGEXT-2 - The Home Depot
Carlon Multi-Gang Non-Metallic Electrical Box Extender (2-Pack) B1MGEXT-2 - The Home Depot
Electrical Box Extension - Cableorganizer.com
Arlington | 2-Gang Box Extender with Larger, Trimmable Flange