4" Square Electrical Box Extension Ring, 1-1/2" Deep, 21 Cu. in., Galvanized

Product Overview

The 4" Square Electrical Box Extension Ring, 1-1/2" Deep, 21 Cu. in., Galvanized Steel, (8) 1/2" & (4) 3/4" Knockouts, UL Listed responds to practical situations with heavy-duty characteristics and everyday convenience that hold up. Designed with Alloy Steel, measuring 3.5"D x 4"W x 4"H, available in Silver. Notable features include expand wiring and wiring capacity, contributing to its thoughtfully designed character.

Key Features

• EXPAND WIRING CAPACITY WITH EASE – Designed to extend existing 4-inch square junction boxes while adding valuable space for conductors, splices, and wiring devices. The 1-1/2-inch deep design provides an additional 21 cubic inches of capacity, making it ideal for remodels, upgrades, and complex electrical installations.
• HEAVY-DUTY DRAWN GALVANIZED STEEL – Constructed from durable galvanized steel using a drawn design for added strength and rigidity. Built to withstand demanding residential, commercial, and industrial environments while providing long-lasting corrosion resistance and dependable performance.
• VERSATILE KNOCKOUT CONFIGURATION – Features (8) 1/2-inch side knockouts and (4) 3/4-inch side knockouts to accommodate multiple conduit and cable routing options. Provides flexibility for a wide range of wiring methods and installation requirements.
• IDEAL FOR JUNCTION BOX EXTENSIONS – Perfect for increasing box fill capacity, extending existing electrical boxes, and creating additional access for conduit runs and electrical wiring. Suitable for lighting circuits, receptacle installations, junction boxes, and other branch circuit applications.
• UL LISTED FOR SAFETY AND CODE COMPLIANCE – Manufactured to meet recognized electrical safety standards for dependable installation performance. Designed for professional-grade reliability and peace of mind on every project.
• AIRMONT PRODUCTS QUALITY – Built for electricians, contractors, and professionals who demand durable electrical boxes, junction box extenders, and electrical housing solutions that perform on the job. Airmont Products delivers trusted quality, dependable construction, and installation-ready convenience. Electricians know us, and we know electricians.

Why Choose the AirmontProducts 4" Square Electrical Box Extension Ring

The 4" Square Electrical Box Extension Ring, 1-1/2" Deep, 21 Cu. in., Galvanized Steel, (8) 1/2" & (4) 3/4" Knockouts, UL Listed delivers on three fronts: well-made build, expand wiring, and satisfying experience. This combination makes it suited for serious extension use.

Best For

The AirmontProducts 4" Square Electrical Box Extension Ring is best suited for: remodels, JUNCTION BOX EXTENSIONS – Perfect for increasing box fill capacity, professional-grade reliability and peace of mind on every project.

Quick Summary

The AirmontProducts 4" Square Electrical Box Extension Ring is a Extension product by AirmontProducts. Material: Alloy Steel. Brand: Airmont Products. Color: Silver. Style: Squared Box Extension. Product Dimensions: 3.5"D x 4"W x 4"H. Price: $11.88.

Product Specifications