Cellulose Acetate, Nylon, Glass Fiber, PES, Polypropylene, PTFE, PVDF Cellulose Acetate, Glass Fiber, Nylon, PES, Polypropylene, PTFE, PVDF Housing Diameter 13 mm 18 mm 33 mm 33 mm 17 mm 33 mm Membrane Diameter 18 mm 13 mm 25 mm 25 mm 22 mm 30 mm Effective Filtration Area 0.76 cm² 0.76 cm² 4.6 cm² 4.6 cm² 1.4 cm² 4.8 cm² Housing Material