These 125mL PYREX® glass separatory funnels have Polytetrafluorethylene (PTFE) No. 2 Product Standard stopcocks and inner and outer 14/20 Standard Taper joints. The PTFE plug fits into the micro-finish barrel. This funnel is also a replacement for organic chemistry kit No. 6949K (0318V10). The plug also reduces freezing problems and grease contamination. For PTFE stopcock plugs, see No. 7681.