H3343 Mackay 1046 Dunbier Brake Coupling Reverse Stop & Pin (Clamshell) | Marine Trailer Part

🔧 Product Description

Genuine Mackay Marine Trailer Products Brake Coupling Reverse Stop and Pin – Part Number: H3343

A replacement reverse-stop block and retaining pin for compatible Dunbier hydraulic and mechanical override couplings. When engaged for reversing, the stop prevents the coupling slide from compressing and unintentionally applying the trailer brakes.

⚙️ Key Features

• Replacement reverse-lock component
• Includes stop and retaining pin
• Suitable for compatible 50mm Dunbier override couplings
• Simple service replacement for lost or damaged hardware
• Allows controlled reversing where the brake system requires manual lockout

📏 Specifications

• Packaging: Replacement component set
• Component type: Reverse-stop block and pin
• The stop must be removed or released before normal road travel

🔄 Cross Reference & Related Parts

• Dunbier packaged reference: 1042C
• Dunbier component reference: 1046
• Parent couplings include 1030, 1032 and 1041 where the installed stop geometry matches

🚤 Compatibility & Application

• Compatible Dunbier hydraulic and mechanical override couplings
• Do not use to mask seized brakes, poor adjustment or hydraulic faults
• Confirm the stop does not remain engaged before driving forward

🔌 Function

Locks the sliding coupling body in the extended position during reversing so override movement does not apply the trailer brakes.

⚠️ Common Signs of Failure

• Trailer brakes apply while reversing
• Stop block is missing, bent or worn
• Retaining pin is lost or does not lock
• Stop will not fit because the coupling slide is damaged
• Reverse stop remains jammed after manoeuvring

📦 Condition

• Genuine Mackay Marine Trailer Products part
• Brand new
• Supplied in original or equivalent packaging