PSF (polysulfone). The convenience of a bottle top filter with the cost savings of a reusable filter housing. Screw securely onto glass media bottles with GL 33 or GL 45 neck sizes. Removable sterilisation membrane support plate is designed to provide max. flow rate and throughput. Vacuum port on lower half of assembly. - Non-cytotoxic. Molded-in graduations. Multiple autoclavable. PSF (polysulfone). The convenience of a bottle top filter with the cost savings of a reusable filter housing. Screw securely onto glass media bottles with GL 33 or GL 45 neck sizes. Removable sterilisation membrane support plate is designed to provide max. flow rate and throughput. Vacuum port on lower half of assembly. - Non-cytotoxic. Molded-in graduations. Multiple autoclavable.