An extra heavy "O" ring to assure watertight fit. To be installed in areas where internal pressure (oil-canning) is NOT present. Ideal for inspection compartments, for clean out or access to shut off valves, back-up fasteners.
| Brand | Beckson Marine |
| ID | 7-5/8" |
| OD | 10" |
| Color | Black |
| Hole | 8-3/8" |
| Center | Non-Skid |