#7.5 Solid Rubber Stopper (SRS)
This #7.5 Solid Rubber Stopper (SRS) is a solid pure white gum laboratory stopper with a top diameter of 1 1/2" and a bottom diameter of 1 1/4". It does not have a hole drilled in it, making it the perfect stopper to use if fermentation has ceased or you are storing a clean and dried container. Fits 1000 ml Erlenmeyer Flasks.
Also available as a #7.5 drilled rubber stopper.