Foxx Life Sciences VersaCap 38-430 Bottle Caps, Vented Top Cap with 0.2um PTFE Membrane, 4/PK 

205-0165-RLS: VersaCap, 38-430, Vented 0.2um. Patented VersaCap is a leak-proof, vented closure that provides the ultimate in top-connection flexibility. Open VersaCap is compatible with a variety of adapter inserts, enabling users to quickly change the top connections of each carboy or bottle to match their application needs. Vented VersaCap offers large finger grips that allow for easy tightening and opening. They are also stackable, and offered in 53mm, 83mm (compatible with most carboys), and 120mm wide-mouth versions that fit exclusively on Foxx Life Sciences 20L, 40L, and 75L EZfil carboys. VersaCap are made from polypropylene, which may be autoclaved at 15 PSI and 121C (250F) for 20 minutes. Vented caps help protect against air and specimen contamination.