Buon Vino Stopper Intermediate - Solid - Fits P.E.T. Carboys and stopper sizes 9.5-10.5, with large lip to prevent over insertion
This Universal stopper has a longer taper to help produce a better fit and a snug seal, and a lip which prevents them from falling into your container.
solid with no hole.
#10 size is recommended for PET carboys.