FMI Valveless Metering Pumps have a unique design in which the piston rotates as well as reciprocates thus eliminating the NRV’s in both suction and discharge. The piston and cylinder are made of high quality 99.99% pure alumina ceramic which gives them a life of almost 5 years. These pumps are very accurate and consistent with flow rates ranging from 0.12ml/min to 2200ml/min. These pumps can also handle viscous fluids and mercury.