PI391 | Extension Ring 4x4x1-1/2in | DiversiTech

Diversitech's Extension Ring (PI391) is a 4x4x1-1/2 inch extension for compatible HVAC systems. This extension ring offers a sturdy construction and efficient performance, making it a reliable addition to industrial and commercial applications. With its compact design, it can easily fit into tight spaces, ensuring seamless integration with existing equipment. The Devco® PI391 Extension Rings, 4 in. length, 4 in. width, 1-1/2 in. depth, 21.0 cubic in. capacity, 3/4 and 1/2 cubic in. knockout are used when extra cubic inch capacity is needed for additional wiring. Galvanized steel.