This drivetrain upgrade is designed to use with Hayward SuperPump pump SP1600X series models SP1600X5, SP1605X7, SP1607X10, SP1608X10, SP1610X15, SP1611X15, SP1615X20, SP1616X20, SP1621X25. For pumps with an SP1600X part number (manufactured before 1983), the use of these new kits (SPX2600CKIT SPX2615CKIT) will upgrade the old pump to our current SP2600X series. This will improve GPM, reduce noise and provide slightly better energy efficiencies. This part must be ordered for specific model and Horsepower. Capacity 1-Horsepower.