The Sterile Optimum Growth™ Bidirectional Transfer Caps (patented) with downstem, allow for easy aseptic transfer of media or cells into and/or out of cell bags, bioreactors, and flasks (from all manufacturers).

The Bidirectional Transfer Cap with downstem works with the 1.6L and 5L Thomson Optimum Growth™ Flasks (patented) and a peristaltic pump. Simply, replace the culture cap with the Transfer Cap and connect to your vessel of choice.