Overview Reviews Product Description This kit will extend the 3 piece, chain drive c-channel rail for a 7' high door to an 8' high door. Compatible with Genie Models: 3022, 4022 Product Videos Product Reviews Write a Review Write a Review × EXTENDER KIT (GENIE) - 8FT CHAIN CHANNEL Review Rating * Select Rating 1 star (worst) 2 stars 3 stars (average) 4 stars 5 stars (best) Name Email * Review Subject * Comments * Recaptcha: