Medi-Vac® Flex Advantage® Flexible Suction Liner 1000 mL Sealing Lid (274616_CS) 50/CSLiners are designed with safety features to provide maximum protection and ease of use during fluid collection, retention and disposal. The liners also include a one way valve built into the inner lid at the patient port to help prevent backflow of fluid, e. g. bile. Flexible suction liner includes float valve shut off lid but does not include a tube. 1000 mL suction liner is graduated.