Firewall Rubber Wiring Grommet Diameter: 51mm (2″) OD 28mm (1 1/8″) ID

Haltech Firewall Grommet (2″ OD / 1-1/8″ ID): The Standard for Main Harnesses

The Haltech 2″ Firewall Grommet (Large ID) is the versatile choice for most aftermarket ECU installations. With a standard 51mm (2″) chassis hole requirement and a generous 28mm (1 1/8″) inner diameter, it is perfectly sized for the main trunk of a typical 4-cylinder or 6-cylinder flying lead harness. Installing this grommet is a mark of professional installation; it prevents the catastrophic failure that occurs when engine vibration saws a wiring harness against bare sheet metal.

Engineering for Durability

Manufactured from oil- and heat-resistant rubber, this grommet maintains its flexibility over time, unlike cheap plastic grommets that become brittle and crack. The deep groove profile ensures it stays seated in the firewall even when the harness is tugged during engine maintenance. It serves as a vital firewall for safety, keeping engine fires and fumes out of the cockpit.

Fitment Guide

• Hole Size: Requires a 51mm (2″) hole.
• Harness Size: Suits bundles approx. 28mm (1 1/8″).

Technical Specifications

Summary & What’s Included

Includes:

• 1 x 2″ Firewall Grommet (Large ID)