Large Curved Coupler fits Models 749PS and up
Small Curved Coupler fits Models 718 – 739PS 
The BCS Curved Coupler easily slides onto the tractor’s hitch, which is located just above the PTO on models 718 and up.
The accessory is required to stabilize and balance the tractor when using tow-behind attachments, most notably the Transport Sulky and Utility Trailer .
It fits onto the tow hitch and is fastened by sliding a pin through the coupler and hitch, allowing the towed implements to rotate side-to-side, but not up and down.
