Buna-N Gasket for 18" x 24" Multi-Bolt Semi-Raised Manhole (Model #MB-G1824-STD)
The Model #MB-G1824-STD is a premium replacement flange gasket engineered specifically for larger 18" x 24" elliptical multi-bolt semi-raised manhole assemblies. Fabricated from high-density Buna-N Nitrile rubber, this heavy-duty die-cut seal features a pre-punched bolt pattern designed to seat perfectly over the standard fastener layout of semi-raised coaming flanges to form an airtight and watertight vapor boundary. The specialized elastomeric formulation delivers high resistance to compression set and tearing, ensuring absolute sealing integrity under commercial cargo deck washdowns and varying tank pressure cycles.
Key Features
- Precision-Punched Standard Bolt Pattern: Die-cut to line up perfectly with standard 18" x 24" elliptical semi-raised coaming fasteners, enabling rapid alignment and drop-in field installation.
- Superior Hydrocarbon & Oil Resilience: Impervious to swelling, degradation, or structural softening when in constant contact with marine fuels, hydraulic lubricants, and ballast tank sludge.
- Balanced Compression Elasticity: Optimized thickness delivers high recovery performance under standard perimeter torque loads without forcing the gasket out of the flange seating zone.