# 1032 Dunbier Mechanical Override Coupling 3500kg | Marine Trailer Part

🔧 Product Description

  

Dunbier Mechanical Override Trailer Coupling 50mm - Heavy-Duty - Part Number: 1032

  

A galvanised 50mm mechanical override coupling with a 3500kg coupling-body rating. Dunbier and Mackay documentation notes that the installed spring and brake-actuation arrangement may be specified for trailers up to approximately 2500kg ATM, so the stamped coupling and trailer compliance information must be checked before use.

  

⚙️ Key Features

  

• Heavy-duty 50mm ball coupling

• Mechanical override slide for cable-operated trailer brakes

• Galvanised corrosion-resistant finish

• Integrated handbrake lever

• Adjustable coupling ball clearance and reverse-stop provision

  

📏 Specifications

  

• Coupling body rating: 3500kg

• Published spring application: Up to approximately 2500kg ATM

• Tow-ball size: 50mm

• Brake actuation: Mechanical override cable

• Tow ball is not included

  

🔄 Cross Reference & Related Parts

  

• Dunbier: 1032

• Adjustment bolt: Dunbier 1011

• Reverse stop and pin: Dunbier 1042C or 1046

• Tow ball: Dunbier 1061

• Related lighter mechanical coupling: Dunbier 1041 / Mackay H3310G

  

🚤 Trailer Compatibility & Application

  

• Suitable for trailers with mechanical disc brakes and correctly configured brake cables

• Use only within the lower of the coupling, spring, brake-system and trailer ratings

• Not suitable for hydraulic brake actuation without the correct master-cylinder coupling

  

🔌 Function

  

Converts compression of the sliding coupling during braking into cable movement that applies the trailer's mechanical brakes.

  

Common signs of wear or replacement:

  

• Slide binds, seizes or has excessive play

• Brake cable is not pulled smoothly

• Return spring is weak or broken

• Handbrake ratchet does not hold

• Coupling trigger or ball socket is worn

  

🛠️ Installation & Safety

  

• Verify the stamped coupling and spring rating before installation

• Set brake-cable free play so the brakes apply progressively without dragging

• Lubricate specified sliding and pivot points without contaminating brake components

• Check reverse-stop operation

• Have the completed brake system tested by a trailer-brake specialist

  

📦 Condition

  

• Brand new Dunbier Marine Products trailer component

• Supplied as one heavy-duty mechanical override coupling without tow ball

• Supplied in original or equivalent packaging

## Details

- **Price:** 215.55 AUD
- **Vendor:** Dunbier
- **Tags:** Dunbier Boat Trailers | Marine Trailer Parts & Accessories

## Variants

| Variant | Price | Available |
|---------|-------|-----------|
| Default Title | 215.55 AUD | In stock |

## Images

- 1032 Dunbier Mechanical Override Coupling 3500kg | Marine Trailer Part
- 1032 Dunbier Mechanical Override Coupling 3500kg | Marine Trailer Part
- 1032 Dunbier Mechanical Override Coupling 3500kg | Marine Trailer Part
- 1032 Dunbier Mechanical Override Coupling 3500kg | Marine Trailer Part

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> Source: [Sawley's Auto and Marine](https://www.sawleysautoandmarine.com.au/products/1032-dunbier-mechanical-override-coupling-3500kg)
> Updated: 2026-08-03