PTFE membrane, pore size 0.2 μm, clear vial color, pack of 100: Pricing: WHAGN203NPUORG: PTFE membrane, pore size 0.45 μm, clear vial color, pack of 100: Pricing: GN503NPEORG: PTFE membrane, pore size 0.2 μm, clear vial, pack of 1000: Pricing: GN203APEORG: PTFE membrane, pore size 0.2 μm, amber vial, pack of 100: Pricing: GN503NPUORG