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 inch
- Top diameter 1-13/16 inch
- Bottom diameter 1-1/2 inch
- Rubber stopper- size 9.5-Drilled
- Drilled 3/8 inch
- Top diameter 1-13/16 inch
- Bottom diameter 1-1/2 inch