Trojan Plunger Coupling 3500kg Capacity for 50mm and 1-7/8" Tow Balls

Built tough for serious towing, this Trojan 3500kg plunger coupling delivers reliability when it matters most. It’s engineered to accommodate both the dominant 50mm tow ball and the 1-7/8" size without needing to swap hardware, making it a versatile choice for mixed fleets or trailers that evolve over time.

Why this Trojan plunger coupling stands out

• Dual-ball compatibility – Fits both 50mm and 1-7/8" tow balls, simplifying setups and reducing inventory needs.
• Anti-rattle design – An integrated anti-rattle screw minimizes movement for a quieter, more stable trailer tow on highways and rural roads alike.
• Security-ready – Provision for fitting a security padlock adds protection when a trailer is left unattended.
• NZ-standard compatibility – In 50mm mode, this coupling complies with NZS 5232-1993, ensuring robust ball-and-socket performance in line with local requirements.
• Strong mounting – Uses the same mounting footprint as Trojan override couplings, and is designed for straightforward installation with 4x 12mm high-tensile bolts.
• Brake system compatibility – Suitable for use alongside electric brakes or driver-operated brake systems, helping you maintain controlled, reliable braking on heavier trailers.

Concrete use cases and practical benefits

Ideal for farm trailers, work trailers, and general-purpose caravans where a single coupling needs to cover both common tow ball sizes. The robust build and secure features reduce the risk of uncoupling or rattling during long hauls, while the padlock provision adds an extra layer of security when parked overnight or at job sites.

What this means for you

• Eliminate the need to maintain separate couplings for 50mm and 1-7/8" tow balls, saving space and ensuring quicker hitch-ups.
• Rely on a heavy-duty Trojan design that stands up to frequent use in demanding environments.
• Maintain confidence in braking integration, whether you rely on electric brakes or manual-driver systems.

Designed for professionals and serious DIYers who tow regularly, this 3500kg Trojan plunger coupling offers a practical, future-proof solution that aligns with NZ standards in the appropriate mode and delivers solid performance across a wide range of trailer setups.