4S Extension Ring 1-1/2" Deep Square, Welded with MKO

Expand your electrical capacity with this Heavy-Duty Electrical Box Extension, offering 43.0 cubic inches of added space—perfect for accommodating complex wiring layouts and increased wire volume. Built from 16-gauge welded sheet steel with a corrosion-resistant galvanized finish, it’s ideal for residential, commercial, and industrial use.

Key Features:

• Expanded Capacity: Adds 43.0 cu in of wiring space for demanding installations

• Material: 16 GA welded sheet steel for lasting strength

• Finish: Galvanized coating for corrosion resistance in any environment

• Knockouts: Includes both 1/2" and 3/4" KOs for flexible conduit entry

• Installation: Equipped with combination Phillips/slotted screws for easy mounting

Built to Handle More. Designed to Last.
This extension box is a reliable upgrade for projects requiring additional space and long-term performance.

UL Listed
Certified to meet UL standards for safe, code-compliant electrical installations.

Dimensions
Width: 4"
Height: 4"
Depth: 1-1/2"
Cubic Inches: 21 cu. in.

Specifications
Material: 16 GA Sheet Steel
Manufacturing Process: Welded
Finish: Galvanized