Ratioflo® Volumetric Pumps (RVP's) are available to meet a wide variety of metering and dispensing applications. Units are available with either single acting or double acting piston designs. The pistons may be air cylinder driven or furnished with linear actuators to provide precision electronic control of the piston's displacement. Net weight is also an alternate choice for metering and dispensing liquids. Here the liquid or product contained in a tote or drum would be placed on a platform scale which would be electronically controlled. The systems can be programmed to provide either "net weight loss" dispensing and/or flow rate monitoring and control.