Mud Box with 4" Square Ring

Carlon blue ENT boxes deliver high-capacity, corrosion-resistant performance for commercial, institutional, and industrial installations where Electrical Nonmetallic Tubing (ENT) is specified. Molded from durable non-metallic materials and finished in distinctive blue for easy identification, these boxes simplify wiring with generous internal volumes—up to 22 cu. in. for single-gang and 38 cu. in. for double-gang—while offering selective ENT openings in 1/2", 3/4" and 1" sizes to match job requirements. Designed for reliable long-term service, Carlon blue ENT boxes resist corrosion and moisture, are compatible with standard covers, extenders, and conduit fittings, and streamline installation, inspection, and maintenance in both new construction and retrofit projects.