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.
- Hole: 6-1/2"
- Color: White
- ID: 6-3/16"
- Center: Diamond
- OD: 8-1/8"