Filamatic® Filling Units (Series FUS and FKS,Type FSV, and Series DUS) are self-contained proportioning pumps designed to dispense preset volumes of fluids with accuracy from ±1/4% or better to ±1%, depending upon the product and the type of pump being used. They are interchangeable on any model Filamatic filling machine, up to the rated capacity of the filler. Available in a wide variety of models for filling virtually any liquid or semi-liquid that will flow through a tube.