Firewall Bushing 4 GA

The Firewall Bushing 4 GA from ALLSTAR PERFORMANCE is an essential electrical component designed to protect wiring and maintain clean, professional installations in automotive and custom vehicle builds. This firewall grommet creates a protective passage for 4-gauge wire through the engine compartment wall, preventing wire damage from sharp edges and isolating electrical conductors from metal surfaces. Custom builders, restoration specialists, and automotive technicians rely on this bushing to ensure safe power distribution systems and lasting reliability in vehicles where high-amperage circuits are standard.

Manufactured from durable black plastic, this firewall bushing features a 0.625-inch inner diameter sized precisely for 4-gauge conductors, while the 1.53-inch outer diameter seats securely in firewall openings. The 1.9-inch thickness provides robust insulation and mechanical support without adding excess bulk, protecting wire from abrasion during engine vibration and thermal cycling. The smooth plastic construction resists corrosion and moisture intrusion, critical factors in engine compartments where condensation and salt spray accelerate electrical degradation and connection failure.

Ideal for alternator upgrades, battery relocation kits, auxiliary lighting systems, and high-output electrical modifications, this firewall bushing is equally valuable in street rods, truck conversions, marine applications, and race vehicles. Installation is straightforward—simply feed 4-gauge wire through the grommet and secure it in the firewall opening with a modest amount of silicone sealant for waterproofing. A single unit is supplied, and the compact 0.1-pound weight makes it easy to stock alongside other wiring and electrical hardware for quick roadside repairs or planned system upgrades.