Over-Running Coupler, for tractors up to 75HP. Free-wheels smoothly when implement exceeds PTO speed. Also adapts older 1-1/8" female to 1-3/8" male, 6 spline. C670FI$44.66 Davis Tractor Parts Ford 8N Dept 24263 Antioch Rd. Andalusia, AL 36421 Phone: 334-222-7214 Fax: 334-222-0025 Email: parts@davistractor.com