Oil Pan Drain Plug - 7/8"-18 fits Case 320 350 420B 430CK 530CK VT4521 fits International 688067C1 fits Ford C5NE6730B fits Allis Chalmers 74026437

Standard 7/8"-16 oil pan drain plug with a white zinc finish, covering a wide span of American-brand farm and construction equipment from the postwar era through the 1970s — Allis-Chalmers, Case, Ford, International, Oliver, and Minneapolis-Moline among others. The 7/8"-16 thread was a common SAE standard across multiple engine families in that period. White zinc provides moderate corrosion resistance; replace the crush washer at each oil change. If reinstalling into an aluminum pan, torque to roughly 15-20 ft-lb — over-tightening strips the female threads quickly.