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Enhanced AirOtop Seals (patented) can be applied as a clean sterile barrier that allows samples to vent while preventing contamination from condensation and airborne particles such as phage, mold, spores, and dust. Enhanced AirOtop Seals replace plastic & metal flask caps, aluminum foil over flasks, cotton plugs, cheese cloth, etc. Enhanced AirOtop Seals are a convenient seal for all different flasks. When used in combination with the Ultra Yield Flasks they become a simple “Disposable Bioreactor” at a fraction of the price. Maximum aeration results from an Ultra Yield Flask using an Enhanced AirOtop Seal