FQRANBO Firewall Pass Through for Holley Terminator X Max — Black anodized aluminum, two-piece

If you’re installing a Holley Terminator X Max harness and want a tidy, durable firewall entry point, this pass-through bulkhead keeps wiring organized, protected, and easier to service than rubber grommets. Built from anodized aluminum with an arc-shaped wire opening and a two-piece clamp design, it eliminates chafing and provides a clean factory-style finish at the firewall.

How does this pass-through prevent harness wear?

The pass-through uses a smooth, curved wire aperture to reduce edge contact and friction compared with raw sheet metal or worn grommets. Because the harness is clamped between two precisely machined halves, it stays fixed and can’t shift under vibration, lowering the chance of abrasion over time.

• Arc-shaped harness hole reduces sharp-edge contact.
• Two-piece clamp holds wiring securely to stop movement.
• Anodized, polished aluminum surface minimizes rough spots.
• Designed sizes accommodate common Holley harness openings.

What are the physical dimensions and port sizes?

This bulkhead offers two different wiring ports to match common harness bundles: a larger 1 1/8" hole and a smaller 3/4" hole inside an outer plate measuring 3.78" by 2 1/8". The compact footprint keeps the pass-through low-profile while still allowing multiple conductor runs through the firewall.

• Outside dimensions: 3.78" × 2 1/8" for a neat firewall fit.
• Main port: 1 1/8" for larger harness groups or connectors.
• Secondary port: 3/4" for smaller wire bundles or vacuum lines.
• Mounts with four bolts for a secure, flush installation.

How easy is installation and service access?

Installation is straightforward: fasten the base plate to the firewall, route the harness, then clamp the top plate and secure with the middle bolts. Because it’s a removable two-piece unit, you can unbolt it for service or adjustments without cutting or replacing the firewall entry point.

• Two-piece construction simplifies routing and reassembly.
• Requires four bolts to secure the assembly to the firewall.
• Base-first mounting makes harness insertion easier during install.
• Designed for repeatable removal and access during maintenance.

What materials and durability features does it offer?

Manufactured from anodized aluminum, the pass-through resists corrosion, withstands elevated under-hood temperatures, and presents a polished finish that cleans easily. The precision-machined faces and anodized surface increase longevity compared with soft rubber grommets which can dry-rot or tear.

• Anodized aluminum construction for corrosion resistance.
• Precision-polished mating surfaces reduce abrasion risk.
• High-temperature tolerance for engine-bay environments.
• Sturdy clamp design prevents long-term loosening or deformation.

Who is this for? Gearheads, engine builders, and DIY installers fitting a Holley Terminator X Max harness who want a cleaner firewall install and improved wire protection will benefit most from the FQRANBO bulkhead. It’s suited to restorations, performance swap projects, and anyone replacing worn grommets or seeking a more serviceable firewall pass-through for wiring harnesses.