Vacuum Filtration Funnel: 250, 500ml GF Prefilter (Optional) Membrane: PES, MCE, CA, ... compatible, and heat-sealed to the support grid to maximize flow rate, reduce foaming and protein denaturization Cat. No.Funnel CapacityFilter ... VFP250B500MLsingle wrapped in PE bag gamma sterile, 24pcs/ctn Vacuum filtration