Polypropylene caps for aseptic liquid transfer of media, biological reagents, pure water and chemicals. Used in applications requiring bioreactors and fermentors. Can be used with carboys or bottles that accept 53 mm or 83 mm closures. Provided with two pieces of tissue culture-grade tubing (0.5 in. I.D.) for aspiration, dispensing, and filling splash guard. Autoclavable.