This two-port Quick Filling/Venting Closure forms a convenient aseptic fluid transfer system for any large Nalgene carboy or bottle that accepts 53B closure. Includes Nalgene 50 platinum-cured 1/4 inch silicone tubing. Socket fittings in the autoclavable 53B polypropylene cap with TPE gasket have internal valves that seal when a tubulation fitting is removed so that container seal integrity is maintained. Ideal for aseptic liquid transfer of media biological reagents and chemicals to and from carboy. Material: white polypropylene cap TPE gasket TPE port caps and Nalgene 50 platinum-cured silicone tubing. Tubing size I.D.: 1/4 inch. Number of ports: 2. Closure size: 53B. Overall height (w/o tubing) x diameter: 2-3/4 x 2-5/8 inches (68.6 x 66.7mm). Autoclavable. Nalgene #: 2162-0531.