PTFE STOPCOCK A separatory funnel is a piece of laboratory glassware used in liquid-liquid extractions to separate (partition) the components of a mixture into two immiscible solvent phases of different densities. Available in cylindrical or pear shape, with glass or PTFE stopcock and different volumes. Polystopper - NS 29/32 Retort Ring to Suit: LW4457-01 : 125mm id If the stopcock is tight or stuck and won't turn - please do not force it. The glass may break. Place the separating funnel in a cool place before trying again. The cool temperature will shrink the PTFE stopcock and it will move free
