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'.
Rubber Stopper- Size 9.5-Drilled
Drilled 3/8" Center Hole
Top Diameter 1-13/16"
Rubber Stopper- Size 9.5-Drilled
Drilled 3/8" Center Hole
Top Diameter 1-13/16"