Chamberlain 8 Ft. Garage Door Chain Drive Rail Extension Kit large modular A typical installation uses (4)

A typical installation uses (4) 20-7/8 In

A 2" minimum side cover is required to obtain the full load

Designed to meet new code standards

Simply install the base when installing the siding

and stucco claddings

Chamberlain 8 Ft. Garage Door Chain Drive Rail Extension Kit large modular A typical installation uses (4)The Chain Drive Rail Extension Kit is required for reliable, everyday operation of Chamberlain chain drive models. Featuring a quick install extension rail and replacement chain, the kit includes everything needed for quick and easy installation. Includes one year warranty, rail extension, replacement chain, all necessary hardware and an instruction manual for easy setup.