CDS-John Blue double action single piston pumps are the most reliable liquid fertilizer systems on the market today.  The variable stroke of the NGP-4055-F pump has a rated flow of 10.2 GPM with a rated pressure of 120 PSI.  Rated speed is 450 RPM s on this clutchless NGP-4055-F single piston-double action CDS-John Blue Pump.  This specific pump has a 1-inch inlet and outlet with 200-series flanges standard.  When this pump is coupled with a flow divider you are guaranteed even application rated from this reliable NGP-4055-F CDS-John Blue piston pump. All standard Piston Pumps are cast iron and manufactured with Viton Piston Packings and Buna O-rings and rod packings. Most commonly used with liquid fertilizers that have a pH greater than 5 and standard herbicides that are compatible with Buna and Viton. Application rates will not change due to temperature fluctuations.  All CDS-John Blue pumps are built to last, and engineered for performance.