This bundle comes with 3 items: (1) Hannay 9915.0042 12-Volt Electric Hose Reel Motor, (1) 5/8" Bore Sprocket for the motor, and (1) #35 Drive Chain. All of the parts included in this bundle can be used as replacements on the Hannay 1500 or 1800 Series Electric Rewind Hose Reels, including models that end in 17-18 (eg. E1526-17-18, E1826-17-18, E1530-17-18, E1830-17-18). Maintain your Hannay Electric Rewind Hose Reel's performance by replacing wearing or damaged parts with the parts included in this Hannay bundle. The Hannay 12V Electric Hose Reel Motor (# 9915.0042) is rated for 1/3 HP and 650 RPM. You must replace the entire motor if your motor has failed. The reason is because the motors cannot be rebuilt or rewound, so the entire motor must be replaced. The 5/8" Bore Sprocket (# 35BS11-5/8) fits the 12V electric motor and # 35 drive chains. It has 11 hardened teeth so it will last longer than sprockets without hardened teeth. The sprocket ensures proper contact with the #35 drive chain, helping to prevent premature wear or breaking. The #35 Drive Chain (# 9912.0028) is for Hannay 1500 or 1800 Series Electric Rewind Hose Reels. It has 116 links with a connecting link and measures 43.5" long.