When you need a reliable pump tooled for multiple applications, select this CDS - John Blue DP-139 diaphragm pump. Rated with a maximum pressure of 580 PSI and an upper flow rate of 13.9 GPM, this pump is ideal for use in agriculture, pest control as well as lawn & landscape applications. Includes a gear box for mounting on 8-13 hp engines with 1" shafts as well as a pressure regulator.