Rubber stopper- size 9.5-DrilledDrilled 3/8 inchTop diameter 1-13/16 inchBottom diameter 1-1/2 inch
Rubber stopper drilled with 3/8"center hole to accommodate standard air locks. Other specs are top diameter 1-13/16" and bottom diameter 1-1/2".
Brand: Midwest Homebrewing and Winemaking Supplies, Model: DB-BG86-0MUB, Color: White