VoltPassThru Auto 2–4 Gauge Metal Firewall Grommet

Description

2–4 Gauge Firewall Cable Pass-Through

Route 2–4 Gauge automotive power cable cleanly through a firewall, floor pan, battery box, or bulkhead. Unlike a basic push-in rubber grommet, the threaded nickel-plated brass body locks securely to the panel while the compression cap grips the cable jacket. The extended thread provides extra mounting reach, while dual NBR panel washers help seal both sides of the mounting surface and protect cable where it passes through sheet metal.

Fitment at a Glance

Actual finished cable O.D. determines fit. Wire gauge is a starting reference. Check the gland against your mounting location before drilling.

Not sure which size fits? Measure your cable O.D. → View the Auto Sizing Guide

Built for Automotive & Car Audio Installations

• Amplifier Power Wiring — route heavy-gauge power cable cleanly through the firewall to an amplifier or distribution block.
• Battery Relocation — secure cable where it passes through battery boxes, rear compartments, and bulkheads.
• Auxiliary Power Systems — useful for inverters, charging circuits, winches, and other high-current wiring.
• Bulkhead & Floor-Pan Routing — help protect the cable jacket where power wire passes through sheet metal.

Why Use a Threaded Firewall Grommet?

• Threaded Mechanical Mounting — locks securely to the panel instead of relying on a push-in fit.
• Compression Cable Grip — tightens around the cable jacket for a secure, finished pass-through and helps reduce movement at the entry point.
• Nickel-Plated Brass Construction — durable metal construction for demanding automotive, battery, and electrical installations.
• Dual NBR Panel Sealing — washers sit on both sides of the mounting surface to help keep the entry sealed.
• Anti-Chafe Protection — the rear Anti-Chafe Bushing helps protect the cable jacket where it exits the threaded body.

Cable Fit & Compatibility

Wire gauge is only a starting reference. Cable jacket diameter varies by brand and construction, so measure your finished cable O.D. before ordering.

Published Cable O.D. Examples:

• KnuKonceptz Kolossus Flex tinned OFC — 4 AWG — 11 mm O.D.
• KnuKonceptz KCA CCA — 4 AWG — 11 mm O.D.
• Sky High Car Audio OFC power cable — 4 AWG — 10.9 mm O.D.
• TEMCo Easy-Flex welding/battery cable — 4 AWG — 8.41 mm O.D.
• TEMCo Easy-Flex welding/battery cable — 2 AWG — 10.49 mm O.D.

Published manufacturer dimensions are provided as sizing examples. Cable jacket diameter varies by brand and construction; measure your finished cable O.D. before ordering. Third-party trademarks belong to their respective owners.

Installation

1. Measure the finished cable O.D.
2. Check the mounting location and clearance.
3. Prepare and deburr the opening.
4. Install the gland with the washers and locknut.
5. Route the cable and tighten the compression cap.
6. Check final cable support and routing.

See the full VoltPassThru Installation Guide for detailed instructions and diagrams.

What’s Included

• 1× VoltPassThru Nickel-Plated Brass Cable Gland
• 1× Compression Cap & Internal Sealing Assembly
• 2× NBR Panel Sealing Washers
• 1× Metal Mounting Locknut
• 1× Anti-Chafe Bushing
• 1× Auto Firewall Installation & Sizing Card