Nalgene™ PTFE funnels. Break-resistant, transparent, non-stick for easy cleaning, non-wetting for complete draining, and impervious to any chemical used in a separatory funnel. Economical answer to continual replacement of fragile, expensive glass funnels. Phase interface of even colorless liquids is visible. Can be used with mechanical shakers if a hose clamp is put over stopcock insertion area. Leakproof Tefzel® closure and PTFE TFE stopcock. Stopcock assembly is easily removed for cleaning. Phthalate-free. Funnels are autoclavable except for stopcock assembly, which can be chemically disinfected. Stem length below stopcock is 65mm.