Universal stoppers have a longer taper to help produce a better fit and a snug seal, and a lip which prevents them from falling into your container. Available with a 3/8 inch hole for an airlock, or solid with no hole.
Medium size corresponds to size #10
Fits the Fermonster & PET carboys
Shipping DIMS – Weight: 0.06 lb. | Height: 1.5 in. | Length: 2 in. | Width: 2 in.