About This Updated OEM Replacement – Since May 2019, the kit part number was 7373828. After April 2020, it was updated to 7384691, now featuring a metal drive gear for improved durability. Replaces Old Part Numbers – This kit replaces 7281291, 7234731, 7228900, 7228544, 7223015, 7252381, 7250622, WS26X10021, and WS26X21821. Please check your existing part number before ordering. Stronger Metal Components – Some water softeners originally had a plastic drive gear and cam gear. This updated kit replaces them with a stronger metal version for better performance and longevity. High-Flow 1″ Valve Compatibility – Designed for 1″ high-flow valves, NOT for the smaller 3/4″ standard valves. Please refer to the product images to ensure compatibility with your unit. Latest Version with Metal Gear – If you order this kit, you will receive the updated 7384691 part, which includes a metal cam gear and a motor with metal teeth. The older 7373828 version has been discontinued, and plastic gears are no longer used in this high-flow system.