Trojan Coupling - Duofit - Override Hydraulic Braked

Trojan's Duofit hydraulic override coupling fits both 50mm and 1-7/8" towballs and is rated to 2,500kg. A compression spring dampens the trailer's braking, and Trojan states it is the only coupling type that complies fully with the NZ towball coupling standard NZS 5232:1993.

Specifications

Measurements

Compatibility

• Towball: 50mm or 1-7/8", so you can swap tow vehicles without changing the coupling.
• Brakes: trailers with hydraulic disc brakes. For mechanical (cable) brakes, see the Trojan mechanical override coupling.
• Weight: up to 2,500kg. Heavier trailers need a braking system the driver controls from the cab; see electric braking systems.
• Drawbar: suits drawbars drilled to the common TC40 182 x 54mm pattern. Measure your existing hole centres before ordering.

What's included

• Trojan Duofit hydraulic override coupling
• 3/4" master cylinder and hydraulic parking brake, fitted
• Anti-rattle screw, with provision for a security padlock

Mounting bolts are not listed as included. Trojan sells a matching bolt kit, linked below.

Fitting notes

• Mount with four 12mm high-tensile bolts, as Trojan recommends.
• Tighten to Trojan's recommended torque for the bolt grade:

Related products

• Trojan coupling bolt mounting kit HTC/TC40 (braked)
• Trojan coupling lock (suits TC30 & TC40 Duofit)
• Pushrod for Duofit override hydraulic coupling (spare)
• Trojan hydraulic backframe, less master cylinder (spare)
• Trojan 3/4" master cylinder assembly (spare)
• All couplings

Guides: Do I need brakes on my trailer? NZ rules explained · Towball Mount Finder