Rockford Fosgate RFFAGU Inline AGU Fuse Holder

Waterproof AGU Inline Fuse Holder 4 AWG or 8 AWG, Custom Tooled Solid Brass, HPP Platinum Finish, Superior Corrosion Resistance.

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Product Overview

The Rockford Fosgate RFFAGU is a waterproof inline AGU fuse holder accepting 4 AWG or 8 AWG wire custom-tooled solid brass with HPP (High Performance Plating) platinum finish. The waterproof construction protects the fuse and contacts from moisture ingress appropriate for under-bonnet, boot, or other locations where water exposure is possible. Suitable for protecting individual amplifier power runs on 4 AWG or 8 AWG positive cables.

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Key Specifications

• Part number: RFFAGU
• Fuse type: AGU (glass tube)
• Wire gauges accepted: 4 AWG or 8 AWG ✓
• Waterproof: Yes ✓
• Construction: Custom tooled solid brass ✓
• Plating: HPP (High Performance Plating) — platinum finish ✓
• Corrosion resistance: Superior (HPP confirmed) ✓
• Compatible fuse amperage: Not specified — confirm with Rockford Fosgate
• Fuse included: Not specified — confirm with Rockford Fosgate
• Pack quantity: Not specified — confirm with Rockford Fosgate (likely single unit)
• Length: Not specified
• Warranty: Not specified — confirm with Rockford Fosgate

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Features & Benefits

• Waterproof Construction — The RFFAGU is explicitly described as waterproof — protecting the AGU fuse and brass contacts from water ingress in under-bonnet, boot-entry, or exposed routing positions.
• 4 AWG or 8 AWG Wire Compatibility — Accepts either 4 AWG or 8 AWG cable, covering the common gauges used for individual amplifier power runs and accessory wiring.
• Custom Tooled Solid Brass — Machined brass body for precise tolerances, high current capacity, and secure fuse seating.
• HPP Platinum Plating — Corrosion-resistant coating maintaining low contact resistance at the fuse terminals over time — important for a holder exposed to moisture and temperature cycling.
• AGU Fuse Compatibility — Accepts standard AGU-style glass-tube fuses available in multiple amperage ratings — select the correct rating for the wire gauge and equipment being protected.

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Technical Specs

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Compatible With / Goes Well With

Suitable for:

• Inline fuse protection on 4 AWG or 8 AWG positive power runs
• Under-bonnet or boot-entry cable routing where moisture exposure is possible
• Individual amplifier power branch protection

Pairs well with:

• Compatible AGU fuses at the appropriate amperage for the connected equipment
• Rockford Fosgate RFD4 distribution block (4 AWG or 8 AWG output branches)
• Rockford Fosgate 4 AWG or 8 AWG wire

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Frequently Asked Questions

What is a waterproof AGU fuse holder used for?

An inline AGU fuse holder provides overcurrent protection on a power cable run — if the cable shorts or exceeds the fuse's rated current, the fuse blows to prevent fire or cable damage. The waterproof construction of the RFFAGU allows it to be installed in locations exposed to moisture, such as near the firewall, under the boot floor, or in external cable runs.

What wire gauges does the RFFAGU accept?

4 AWG and 8 AWG — confirmed in the product description. Do not use with 1/0 AWG wire; the RFFDAGU distribution block or a larger dedicated fuse holder is required for 1/0 AWG runs.

Does the RFFAGU include an AGU fuse?

Not confirmed in the supplier data. Confirm from the official Rockford Fosgate RFFAGU product page before purchasing.

What amperage AGU fuse should I use?

The fuse rating should be appropriate to the maximum current draw of the connected equipment and must not exceed the current capacity of the wire gauge used. Confirm the correct rating with Rockford Fosgate or your installer.

Where should the fuse holder be installed?

Within approximately 450mm (18") of the power source terminal (battery positive or distribution block output terminal) on the positive power run to the amplifier or accessory.