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This accessory has one end attached to the tractor tow hitch while the shaft is a 1 1/8” solid steel rod with some holes drilled horizontally. This coupler rod simply slides into the hollow tongue of the trailer and is locked in place by a pin secured through the holes.
Most wheeled implements such as lawn aerators, seeders, spreaders, carts etc. also can be adapted and pulled by having a pipe affixed to the tongue so the coupler can be attached.