# 1042C Dunbier Brake Coupling Reverse Stop and Pin Clamshell Pack 1046 | Marine Trailer Part

🔧 Product Description

  

Dunbier Brake-Coupling Reverse Stop and Pin - Clamshell Pack - Part Number: 1042C

  

A retail clamshell-packaged reverse-stop and retaining-pin set for selected Dunbier mechanical and hydraulic override couplings. The stop temporarily restricts coupling-slide movement when reversing a trailer whose brake system would otherwise apply from reverse overrun force.

  

⚙️ Key Features

  

• Packaged replacement reverse-stop assembly

• Includes the stop and retaining pin

• Designed for selected Dunbier override couplings

• Quick removable arrangement for reversing

• Retail clamshell packaging

  

📏 Specifications

  

• Packaging reference: Dunbier 1042C

• Underlying/bulk component reference: Dunbier 1046

• Mackay related reference: H3343 reverse stop and bolt

• Exact stop profile must match the coupling slide

  

🔄 Cross Reference & Related Parts

  

• Dunbier: 1042C

• Dunbier bulk/reference component: 1046

• Mackay: H3343

• Used with selected Dunbier 1030, 1032 and 1041 override couplings

  

🚤 Trailer Compatibility & Application

  

• Suitable only for override couplings designed with the matching reverse-stop location

• May not be required with free-backing brakes or electrically controlled reverse lockouts

• Remove or disengage the stop before normal forward towing where specified

  

🔌 Function

  

Prevents the override coupling from compressing and applying trailer brakes during reversing.

  

Common signs of wear or replacement:

  

• Pin is bent, loose or missing

• Stop no longer fits securely

• Coupling still compresses with the stop installed

• Stop interferes with normal forward operation

• Corrosion or wear allows unintended release

  

🛠️ Installation & Safety

  

• Confirm the trailer cannot roll before fitting or removing the stop

• Use only during reversing and follow the coupling instructions

• Ensure the stop is removed or placed in its travel position before forward towing

• Never use an improvised bolt that can damage the coupling

• Replace the complete set if the pin-retention method is unreliable

  

📦 Condition

  

• Brand new Dunbier Marine Products trailer component

• Supplied as one clamshell-packed reverse stop and pin set

• Supplied in original or equivalent packaging

## Details

- **Price:** 19.8 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 19.80 AUD | In stock |

## Images

- 1042C Dunbier Brake Coupling Reverse Stop and Pin Clamshell Pack 1046 | Marine Trailer Part
- 1042C Dunbier Brake Coupling Reverse Stop and Pin Clamshell Pack 1046 | Marine Trailer Part
- 1042C Dunbier Brake Coupling Reverse Stop and Pin Clamshell Pack 1046 | Marine Trailer Part
- 1042C Dunbier Brake Coupling Reverse Stop and Pin Clamshell Pack 1046 | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/1042c-brake-coupling-reverse-stop-pin-clamshell-dunbier-1046)
> Updated: 2026-08-03