Cole-Parmer Separatory Funnel, 250 mL, PP 2/pk Go to amazon.com Related posts Which is the best separatory funnel 250ml? FeatureMaterial: polypropylene (pp)Capacity (oz.): 8Capacity (ml): 250Stem length (inch short): 2.5937Stem length (mm): 66 DescriptionFunnels feature a leak-proof threaded screw cap. Polypropylene Stopcock is fitted with a self-lubricating PTFE plug which is push-fitted to the stem of funnel.