4" Square Extension Box 1-1/2" Deep with 1/2" & 3/4" Knockouts - Heavy-Duty Metal Ceiling Box Extender for Upgrades | Reliable Electrical Box Extenders, Conduit & Device Installations

The Ark Lighting 4" Square Extension Box is designed to solve one of the most common issues in electrical work—limited space inside an existing electrical box during upgrades or renovations. Built from galvanized steel, this heavy-duty box extender provides the added depth needed to safely organize wires, connectors, and devices without overcrowding or compromising installation quality. Whether you are expanding a circuit, adding conduit, or modifying an existing layout, this extension box offers the reliable support needed for clean and secure electrical work. With its 1-1/2" deep profile, this electrical box extension provides the extra capacity required when working with multiple conductors or device setups. It is especially useful during remodels, when an original box becomes recessed behind new wall material or when additional wiring must be accommodated. Electricians, contractors, and DIY users can rely on this electric box extender to maintain safe wire spacing while improving overall organization inside the enclosure. The combination 1/2" and 3/4" knockouts make this unit highly adaptable for different conduit sizes and routing needs. Whether used for lighting, outlets, or equipment wiring, this extension box supports a wide range of box extenders electrical applications. Its universal compatibility with standard 4" square boxes ensures it integrates smoothly with existing electrical setups. It also functions as an ideal solution for outlet box extension work, providing ample space behind switches, receptacles, and device plates. Installation is straightforward and supports both surface and flush mounting. This flexibility makes the extension suitable for residential, commercial, and maintenance projects. It also works effectively alongside electric box extenders for outlets and other outlet box extenders, giving installers more options when modifying or expanding wiring during upgrades. Engineered for electricians, contractors, maintenance teams, and homeowners, this steel box extender provides dependable performance in situations where wiring space is limited, code compliance must be maintained, or system expansion is required. With this 4"" square extension box, users gain greater installation flexibility, safer wire management, and a durable solution for long-term electrical reliability.

• DURABLE GALVANIZED DESIGN: This junction box extender fits any 4 square electrical box and works as a ceiling box extender, 4 outlet extender, and strong option among electrical box extenders or an electrical box extension ring for wiring upgrades.
• ADDED WIRING SPACE: Use this junction box extender to expand depth safely. It functions as a ceiling box extender and 4 outlet extender, fits a 4 square electrical box, and supports clean installs with electrical box extenders or an electrical box extension ring.
• FLEXIBLE KNOCKOUT OPTIONS: Designed with 1/2" & 3/4" knockouts, this junction box extender works as a ceiling box extender, 4 outlet extender, fits any 4 square electrical box, and pairs well with electrical box extenders or an electrical box extension ring.
• EASY MOUNTING:This junction box extender installs quickly for pros and DIY users. It serves as a ceiling box extender, 4 outlet extender, fits a 4 square electrical box, and is fully compatible with electrical box extenders or an electrical box extension ring.
• IDEAL FOR RENOVATION WORK: Great for remodels, this junction box extender performs as a ceiling box extender and 4 outlet extender, fits any 4 square electrical box, and works smoothly with electrical box extenders or an electrical box extension ring in wiring projects.