Firewall Grommet -12an

The SEALS-IT Firewall Grommet -12AN (part number GS100312) is a precision-engineered aluminum and rubber pass-through grommet designed to seal and protect fluid lines passing through engine firewalls and bulkheads. With a 3-inch outer diameter, 0.75-inch inner diameter, and 0.12-inch thickness, this single-hole grommet provides a watertight barrier while accommodating 12AN hose connections in high-vibration applications where leakage and corrosion present operational risks.

The dual-material construction—aluminum outer ring with natural rubber sealing surface—delivers chemical resistance and durability across marine, automotive, and industrial fluid systems. The 0.12-inch wall thickness is engineered to prevent flex fatigue while maintaining a tight seal under pressure cycling. The black exterior finish resists oxidation in salt-air environments, while the natural rubber inner surface provides the elasticity necessary to accommodate standard hose diameters without permanent deformation. This design ensures consistent performance across thermal cycles from cold-soak conditions to engine-bay temperatures.

This grommet is essential for marine engine installations, custom automotive fuel and coolant systems, and hydraulic fluid routing where firewall penetration is unavoidable. The -12AN specification indicates compatibility with 12AN (3/4-inch outer diameter) hose standards commonly found in performance automotive, marine propulsion, and industrial hydraulic applications. Each unit is sold individually; systems requiring multiple penetrations will need corresponding quantities.

SEALS-IT's firewall grommet line represents OEM-equivalent sealing solutions for applications where factory grommets are unavailable or undersized. This product is a direct replacement component suitable for restoration, repair, and custom fabrication work where fluid-system integrity depends on reliable barrier sealing at structural penetration points.