Firewall Rubber Grommet - 51mm (2") OD 28mm (1 1/8") ID

Overview

Professional-grade firewall grommet designed for clean, weatherproof engine loom penetration on performance builds. Essential for protecting high-value wiring from sharp metal edges and environmental ingress during EFI conversions, turbo builds, and motorsport applications.

Technical Specifications

• Part Number: HT-039001
• Outside Diameter: 51mm (2")
• Inside Diameter: 28mm (1 1/8")
• Material: High-grade rubber compound
• Temperature Range: -40°C to +120°C

Why You Need This

Every engine conversion faces the challenge of routing the main engine loom through the firewall cleanly and safely. Cut a hole too large, use the wrong grommet, or skip it entirely, and you're inviting water ingress, chafing damage, and potential electrical faults. This 28mm ID grommet is perfectly sized for typical Haltech engine looms while the 51mm OD provides excellent sealing against the firewall aperture.

We see this constantly on LS swaps into RX-7s, 2JZ conversions in BMWs, and turbo SR20 builds — the firewall penetration is often an afterthought until water starts pooling in the ECU location or wires start chafing through. This grommet eliminates both issues with proper strain relief and environmental sealing. The rubber compound is fuel and oil resistant, crucial when routing near brake master cylinders or in engine bay environments where vapour exposure is inevitable.

ECU & System Compatibility

Ideal for main engine loom routing on all Haltech ECU installations including Elite 550, 750, 1000, 1500, 2000, and 2500 systems, plus Nexus R3 and R5 platforms. The 28mm ID accommodates standard Haltech loom connectors and multiple smaller wires bundled together. Also suitable for auxiliary sensor wiring and custom loom fabrication.

What's in the Box

• 1x Firewall rubber grommet (51mm OD, 28mm ID)

Complete Your Build

Most customers completing EFI conversions also require our range of Deutsch connectors, engine loom extension cables, and bulkhead fittings for fuel lines. Our technical team can advise on the complete wiring solution for your specific conversion — from ECU selection through to professional loom fabrication. With UK stock and same-day despatch on most electrical components, we keep your build moving forward without delays.