VersaCap® systems provide the ultimate in top-connection flexibility. "Open Top" have a large hole which 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. VersaCaps have a unique shape that allows for easy tightening and opening, unlike traditional round caps. They come in 53B, 83B and 120mm sizes. Most VersaCaps are made from polypropylene, which can be autoclaved. Special adapters and tubing may need other treatment.