Leakproof, PP caps and interchangeable cap adapters provide a wide range of top connection configurations. Each cap is compatible with several adapters allowing you to change and configure carboy top connections based on your application requirements. Designed to be stackable, the caps feature large grips allowing you to easily open and tighten and include platinum cured silicone gaskets. Adapters are available with quick connect hose barb options including two, three or four port combinations, as well as molded-in hose barb options, offering additional top connection flexibility. Recommended autoclave cycle: 15 psi and 250 °F for 20 min. Justrite® Carboy Cap Adapter, Closed, 120 mm Mouth, 4.7 in Diameter, 2.1 in Height, Polypropylene, White