Patented 120mm Adapter Insert VersaCap® is leak-proof, has replaceable platinum-cured silicone gaskets, and 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. VersaCap® offers large handles with finger grips that allow for easy tightening and opening. They are also stackable and are 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.