Firewall Gromment 4in OD 1-3/4in ID

The Firewall Grommet 4in OD 1-3/4in ID from SEALS-IT is a precision-engineered sealing component designed to route electrical harnesses, fuel lines, and brake lines through engine firewalls while maintaining a tight, vibration-resistant seal. Whether you're performing a complete engine swap, installing custom wiring for a turbo upgrade, or integrating aftermarket fuel systems, this grommet prevents moisture and road debris from entering the cabin while protecting wire insulation from sharp firewall edges. Fabricators and restoration specialists rely on firewall grommets to achieve factory-quality electrical integrity in modified and custom builds.

Constructed from a durable aluminum and rubber composite, the Firewall Grommet 4in OD 1-3/4in ID features a 4-inch outer diameter with a 1-3/4-inch inner diameter opening, delivering the versatility needed for multi-cable or bundled harness applications. The aluminum body provides structural rigidity to maintain shape under high-vibration engine bay conditions, while the natural rubber seal grips installed components securely without crushing or pinching delicate wiring. At just 0.04 pounds and measuring 3.6 x 0.25 x 3.6 inches, this compact design fits standard firewall openings without requiring modification, making installation straightforward for both single-hole and multi-line routing scenarios.

This grommet is essential for engine swap builds, custom harness installations, and any application where electrical or fluid lines must transition the firewall barrier. Mechanics working on LS conversions, turbo retrofits, and fuel system upgrades will appreciate the reliable seal that prevents water intrusion and maintains environmental isolation between engine and cabin compartments. The black and natural finish resists corrosion, and the design accommodates various wire gauges and hose diameters simultaneously, making it an indispensable component for professional and enthusiast-level automotive modifications where durability and authenticity matter.