Flat head PTFE stoppers are used as closures for laboratory glassware such as solution bottles and separatory funnels with Standard Taper (ST) medium length joints. Solid, bottle-style stopper made of PTFE that has excellent chemical resistance and resists freezing in ground glass joints. Color button insert on top of the stopper serves as a means of color coding.
Bottle Stopper Size: 34
Used with Joint: 34/45