STH and STQ Duplex metering pumps are ideal for precision mixing, diluting and proportional metering for OEM medical, analytical and industrial instrumentation. The pumps consist of two FMI valveless pump heads direct coupled to a single variable stepper motor drive. The pumps feature CeramPump valveless piston pumping technology. The result is a valveless pump design that eliminates the multiple syringes, valves, actuators and drivers required by conventional syringe pumps for continuous fluid dispensing and metering.