Our #2 Solid Rubber Stopper (SRS) is a solid pure white gum laboratory stopper. The top diameter is 13/16" and the bottom diameter is 5/8". This stopper is solid and does not have a hole drilled in it. A perfect stopper to use if fermentation has ceased or you are storing your clean and dried container.

Fits standard and .

This #2 rubber stopper is also available as a .