The 10 Drilled Rubber Stopper (DRS) is a pure white gum laboratory stopper. The top diameter is 1 15/16″, the bottom diameter is 1 5/8″, and it has a 3/8″ hole drilled in the center, the perfect size for an airlock.
This is size of stopper you’ll want to use with Better Bottles.
This stopper is also available as a 10 solid rubber stopper (srs).
