Our 13 Drilled Rubber Stopper (DRS) is a pure white gum laboratory stopper. The top diameter is 2 11/16″, the bottom diameter is 2 5/16″, and it has a 3/8″ hole drilled in the center, the perfect size for an
airlock
.
This 13 rubber stopper also comes as a
13 Solid Rubber Stopper (srs)
.
