Firewall Rubber Wiring Grommet Diameter: 63.5mm (2.5″) OD 44.45mm (1.75″) ID

Haltech Firewall Grommet (2.5″ OD): The Seal of Integrity

Passing a large wiring harness through a metal firewall is a critical point of vulnerability. Without proper protection, vibration can cause the sharp sheet metal to saw through wire insulation, causing catastrophic short circuits and fires. The Haltech Firewall Rubber Grommet (2.5″ OD) is a heavy-duty seal designed to protect large main engine harnesses. With a generous 1.75″ inner diameter, it accommodates bulky looms typical of modern EFI systems with multiple shielded cables. Made from high-grade synthetic rubber, it resists drying, cracking, and engine bay chemicals.

Engineering for NVH and Safety

Beyond wire protection, this grommet is essential for sealing the cabin. It prevents carbon monoxide, unburnt fuel fumes, and engine bay heat from entering the passenger compartment. It also significantly reduces Noise, Vibration, and Harshness (NVH), keeping injector tick and valvetrain noise out of the cabin. The wide groove design allows it to seat securely in sheet metal of varying gauges.

Fitment Guide

• Hole Size: Requires a 63.5mm (2.5″) hole saw cut.
• Harness Size: Suits bundles up to 44.45mm (1.75″).

Technical Specifications

Summary & What’s Included

Includes:

• 1 x 2.5″ Firewall Grommet