#6 Drilled Rubber Stopper (DRS)
Our #6 Drilled Rubber Stopper (DRS) is a pure white gum laboratory stopper. It has a top diameter of 1 1/8", a bottom diameter of 1 1/16", and has a 3/8" hole drilled in the center, perfect for a 3-piece airlock or ripple airlock.
Great for small mouth one gallon jugs.
This #6 drilled rubber stopper is also available as a #6 solid rubber stopper.