Kimble kimax funnels funnel is supplied with a standard taper ground glass stopper and a ptfe stopcock gradually tapering shoulders and a wide neck facilitate cleaning sharp separations are provided for by a narrow bore in the body just above the stopcock replacement stopper is 850100 replacement stopcock plug is 41500f designed from astm specification e1096, type 2 requirements manufactured from 33 expansion, low extractable borosilicate glass conforming to usp type i and astm e438, type i, class a requirements. Warning: this product can expose you to chemicals including tetrafluoroethylene, which are known to the state of california to cause cancer. Prop 65 warning