Medi-Vac® Brand Guardian™ Suction Canisters - Our disposable hard canister systems are available in a variety of sizes for almost any suction procedure. An automatic overflow shutoff valve is located inside the lid to help prevent cross contamination of regulators and wall vacuum outlets, and 90° adapters allow tubing to connect at right angles to help prevent kinking and impeded fluid flow. The locking lid on the 1200, 2000 and 3000cc sizes encourages the proper disposal of collected wastes and enhances worker safety. Accessory port and orthopedic port are included. 40 canisters per case.