These filter funnels are designed and packaged specifically for sterility testing within isolators. Individually sealed funnels contained within an overpack bag provide easy transfer and sterilization within isolators. Unique squeeze separation and clearly marked graduations provide easy handling and simple access to membrane for culturing. Funnels are available with Supor* polyethersulfone membrane to minimize binding of inhibitory substances like preservatives or antibiotics, or GN-6 mixed cellulose ester membrane for most sterility testing applications. Gamma irradiation sterilized.