PES Bottle-Top Filter Units (75mm membrane diameter, 0.2um pore size, 45mm neck) 500mL , case/12 (Nalgene)

Steritop-GP PES Filter Units, 500mL, 0.22um pore size, 33mm neck, radio-sterilized, 12/pk [TOPS ONLY] (Millipore)

Steritop™ Quick Release Bottle Top Filtration System, 45 mm threaded bottle top filter with 0.22ėm pore size fast flow PES Express PLUS membrane, 500mL, 12/pk (TOPS ONLY) (Millipore)

NalgeneŽ Rapid-Flow™ Bottle-Top Vacuum Filters, Surfactant-Free Cellulose Acetate, Sterile, (75mm membrane diameter), 500mL (0.2um pore size), case/12 (Nalge Nunc)

PES Bottle-Top Filter Units (75mm membrane diameter, 0.2um pore size, 33mm neck) 500mL , case/12 (Nalgene)