Justrite 12887 Open Top Carboy Cap & Tubing, 83mm, 1/4in Barbs, Eliminate open-air pouring of high valued products with this leak proof, closed system. Pre-mounted platinum-cured silicone tubing allows for easy customization of carboys. Designed for aseptic fluid handling in pharmaceutical, biotechnology and laboratory applications, these filling and venting closures feature pre-mounted lengths of platinum-cured silicone tubing, a platinum-cured silicone gasket, and a polypropylene cap and adapter with molded-in hose barbs that accept additional fluid transfer components such as aseptic connectors and air vent filters. All components can be autoclaved at 15 PSI and 250 Degrees Fahrenheit for 20 minutes. Note: Height includes pre-mounted tubing. Cap only, Carboy not included.