Home>> C5NN3N639A - Relief Valve Plug Relief Valve Plug - Fits Ford® - C5NN3N639A Sugg. Retail Price: $28.95/EA Out of Stock Quantity: EA Product Details # C5NN3N639A New (Aftermarket Part) Relief Valve Plug Weight: 0.10 lbs Replaces Tractor Part #: WARNING: Cancer and Reproductive Harm www.P65Warnings.ca.gov Where Used FITS FORD® 4500, 515, 535 Specifications Instructions Any use of OEM part numbers is for reference only. Need help finding a tractor part? Give us a call at 1-800-462-7335.