Firewall Grommet 2-Hole 5.750in x 3in .500in ID

The Firewall Grommet 2-Hole 5.750in x 3in .500in ID by SEALS-IT is a precision rubber seal designed to protect wiring and fluid lines as they pass through engine firewalls in custom automotive builds and engine conversions. Whether you're performing a complete engine swap, installing a modern fuel injection system into a classic vehicle, or routing aftermarket wiring harnesses through the firewall, this grommet prevents electrical shorts, moisture intrusion, and chafing damage. It's an often-overlooked but critical component that separates amateur fabrication from professional-grade restoration work.

Engineered by SEALS-IT, a trusted manufacturer of automotive sealing solutions, this firewall grommet features two independently sized holes to accommodate different wire gauges, hose diameters, or dual-circuit configurations in a single pass-through. The larger opening accepts 0.500-inch inner diameter components, while the design allows controlled passage of multiple fuel lines, brake lines, and wiring without stacking multiple grommets. The durable rubber composition resists heat cycling, oil exposure, and vibration without hardening or cracking—essential properties when installed near exhaust manifolds or engine block surfaces that routinely exceed 150°F. Its compact 5.750-inch by 3-inch profile fits tight firewall spacing in both vintage and modern engine bay layouts.

This grommet is ideal for fabricators, restoration shops, and serious DIY builders undertaking LS engine swaps, fuel system upgrades, or complete electrical system rewiring on street rods and classic vehicles. Installation is straightforward: drill two appropriately sized holes in the firewall and press the grommet into place, then route your lines or harnesses through the factory-molded passages. Its universal sizing makes it compatible with most domestic and imported vehicles where custom firewall penetrations are required. For any build that demands clean, professional results and long-term reliability, the SEALS-IT firewall grommet is an essential investment.