Lippert helps you take the guesswork out of replacement parts by providing direct replacement components that will get your rig and your equipment up and running like usual. This Through-Frame Replacement 15-Tooth Standard Gear Assembly will help get your RV's slide-out back to operating in no time. As an exact-match component, installation is easy and no assembly is required. This is a replacement, 15-tooth 2.5" x 2.5" standard gear pack assembly for through-frame RV slide-outs manufactured after October, 2013. Please reference your owner's manual before purchase to ensure compatibility. Through Frame Slide-Out TechnologyElectric slide-outs gear/teeth movement is continuous, making slide operation more consistent. Design allows for easy timing adjustment. Comes completely assembled and ready to be installed. Plastic wear pads eliminate arm roller noise; no lubrication required.• Replacement standard 2.5" x 2.5" 15-tooth gear pack assembly• Used for through-frame slide-out• Easy, DIY installation• Exact-match component• Units manufactured prior to October, 2013 will use an 18-tooth gearPLEASE NOTE: 15-tooth gear is included. If you have an 18-tooth gear (Lippert Part Number 122739), you will need to purchase that separately. Replacement 15-tooth 2.5"" x 2.5"" standard gear pack assembly For through-frame RV slide-outs manufactured after October, 2013 Units manufactured prior to October, 2013 require an 18-tooth gear (not included) | Lippert 2.5" x 2.5" Standard Gear Pack for Slide-Outs