4" Square Steel Box Extensions – Drawn with Conduit Knockouts

These 4" Square Steel Box Extensions are designed to extend the depth of existing 4" square electrical boxes in wall or ceiling installations. Manufactured from galvanized drawn steel, they provide a strong, fire-rated, and code-compliant solution when additional wiring space is required.

Built-in conduit knockouts allow seamless integration into conduit-based wiring systems, making these extensions ideal for commercial and residential electrical applications.