Perform biopharmaceutical aseptic fluid transfer or sampling applications with the tri-clover flange of Thermo Scientificâ„¢ Nalgeneâ„¢ PPCO Centrifuge Bottles, molded of transparent polypropylene copolymer. Ideal for large-volume cell harvesting, pelleting and protein purification, these translucent bottles are autoclavable and have excellent mechanical strength properties.