Medi-Vac® Brand Flex Advantage® Suction Liners - 1-piece liners reduce potential for breakage - Our liners are designed with safety features to provide maximum protection and ease of use during fluid collection, retention and disposal. The large-bore patient port allows highly viscous fluids and bone chips to pass into the canister. The liners also include a one-way valve built into the inner lid at the patient port to help prevent backflow of fluid. The rigid outer canisters are reusable. Liners are available separately or in kits with nonsterile patient tube.