Preeflow eco-Duo rotating, pressure-tight displacement system has self-sealing rotor/stator design. Conveyance action by medium displacement in the stator through controlled rotor movement. Safe conveyance without any modification of the medium. Suck back option aids in clean and controlled material or medium cut-off while preventing post-dripping. Repeat accuracy reportedly >99%.
ViscoTec, http://www.preeflow.com/en/dispenser-2k