Single-gang old work box with a 20 cubic inch capacity, measuring 4-1/8" x 2-5/16" x 3-5/8" deep. Designed for large wiring devices and extra wire capacity, it features lightweight, high-impact PVC construction. Suitable for use in existing construction and remodeling, it fits into standard 2" x 4" walls and is UL Listed for fire resistance. Compatible with nonmetallic sheathed cable, Carlon® Zip Box® Blue™ provides easy installation for residential and light commercial applications, making it the contractor's choice for efficiency.