Genie 36451A Garage Door Opener Chain Idler Pulley Genuine Original Equipment Manufacturer (OEM) Part Wear work gloves to protect your hands Chain idler pulley 36451A guides the chain cable through the end of the rail closest to the door Genuine Original Equipment Manufacturer (OEM) part. Compatible Brands: Genie This chain idler pulley (part number 36451A) is for garage door openers Shut off the electrical power before installing this part