This contains 11 different parts that are used to rebuild a shaker. It is everything you need to rebuild a shaker motor on the type of parts that are going to wear out. The kit includes: M263 Shock Bushing, M264 Wear Ring, M265 Piston O Ring, M266 Head O Ring, M267 Head Retaining Ring, M293 Transfer O Ring, M296 Check Valve Disk, M297 Valve Disk, M298, M305 Filter, M310 Hose Clamps (2), M311 Air Hose.