These sterile polypropylene caps with an 0.2 micron hydrophobic filter are ideal for use with glass spinner flasks or roller bottles with 45mm screw thread. Opening is covered with a hydrophobic filter to allow a flask or bottle to "breathe" while eliminating baterial contamination from this venting. Allows gas exchange while preventing liquid, water, or contaminants from passing through the filter.
Caps are individually wrapped. Not autoclavable.