These 100mL PYREX® cylindrical separatory funnels are graduated to show approximate capacity, have a micro-finish No. 4 Product Standard Polytetrafluorethylene (PTFE) stopcock and inner and outer 24/40 Standard Taper joints. The PTFE plug fits into the micro-finish barrel. The plug also reduces freezing problems and grease contamination. For replacement PTFE stopcock plugs, see No. 7681. This funnel is also a replacement part for organic chemistry kits No. 6949.