Nalgene 342020-0030 Square Plastic Media Bottle, Graduated Check valves prevent backflow by

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Nalgene 342020-0030 Square Plastic Media Bottle, Graduated Check valves prevent backflow by30mL PETG square media bottles with natural HDPE closures are specifically designed for packaging and shipping liquid medias, buffers and sera. These heavy walled, durable, square PETG bottles save space, are shatter resistant and provide excellent gas barrier properties. These sterile, non pyrogenic bottles save you time from costly cleaning preps that are necessary with similar glass products. Bottles feature molded in graduations, drip proof neck