The feature of the override coupling is the sliding shaft and spring inside attached to the tow ball housing. This spring allows for when the driver applies brake pressure, it pulls on the brake cable and thus braking system. Available in painted or zinc, this 2000kg rated coupling suits 50mm tow balls and meets Australian Design Rules, complying with ADR4177.3. The release mechanism allows for quick and easy application or removal with pad-lockable loop to keep your trailer secure. The hydraulic override coupling also includes a hydraulic brake bracket and 3/4″ master cylinder.