The tube rail chain extension kit is to be used in conjunction with the 5 piece rail system for the Chain Drive 550, when the door measures 8 ft in height. The extension kit rail replaces the end section of the 5 piece tube rail system. Installation is easy with no additional assembly hardware. Extension kit cannot be used on the Chain Drive 500.
Manufacturer: THE GENIE COMPANY
Manufacturer's Part Number: 39027R
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