When it comes to metering and injection pumps for agriculture fertilizers and chemicals, Barndoor Ag’s selection of piston pumps will redefine your precision application expectations. Our ground- and hydraulic-driven, variable rate piston pumps have a reputation and history built on superior performance, serviceability, and overall quality. Our supply of CDS-John Blue Ag Piston Pumps are engineered and tested to set the standard for liquid metering pumps. Pumps like our CDS-John Blue 21 GPM, 120 PSI Single Piston Double Acting Pump and CDS-John Blue 68.4 Double PST Pump exceed expectations and maintain their reliability regardless of age. Pump performance can be maximized by the Shurflo Oil Change System, which removes and stores oil safely and cleanly. Visit our website for more information or speak with an agriculture specialist today.