Gear Reduction Kit For use in Pump Models 9910-D30, 9910-D303 and 9910-D403 6:1 gear box For standard 5.5 hp gas engine with 3/4" shaft Can be used with 9910-D50, 9910-D503 and 9910-D813, providing that This kit can also be used with 9910-D50, 9910-D503 and 9910-D813, providing...