#7.5 Drilled Rubber Stopper (DRS)


The #7.5 Drilled Rubber Stopper (DRS) is a pure white gum laboratory stopper. The top diameter is 1 1/2", the bottom diameter is 1 1/4", and it has a 3/8" hole drilled in the center, the perfect size for an airlock.

The #7.5 rubber stopper fits most 1000 ml Erlenmeyer Flasks and is also available as a #7.5 solid rubber stopper.