a flow - through vacuum degassing unit for degassing a liquid includes a vacuum chamber adapted to be connected to a source for creating a vacuum in the chamber , inlet and outlet connections for admitting and discharging liquid to be degassed and one or more tubes for conducting the liquid through the chamber , wherein the tube is formed in a predetermined , memoried configuration and capable of self - supported containment in the vacuum chamber , the tube being of a thin - walled semi - permeable polymeric resin material .