This Chain Drive Sprocket sits on the shaft on top of the power head. The chain goes around the sprocket and the teeth on it grip the chain so it stays on track. This is used on multiple Genie model garage door openers that have the chain drive rail system. (See below)

• Compatible with Models; 1035, 2033, 2035, 3035, 7035, Chain Drive 750, Chain Glide Connect, Chain Drive 550, Chain Drive 500
• If you do not see your model on this list and have questions please contact Genie for compatibility questions
• Genuine Genie Replacement Part