Application : For 2011-2021 Ford Super Duty F-250, F-350, F-450 and F-550（equipped with 6.7L Power Stroke Diesel）, For Ford Super Duty F-650 F-750 2016-2021（equipped with 6.7L Power Stroke Diesel）. Replace Part Number : 303-1514.Alternate ST-138 Function : 303-1514 is used to install the rear crankshaft seal without damaging the seal, it credibly prevents the seal from leaking.Make sure that the installation depth of crankshaft oil seal is correct. High quality : Made from high quality steel coated with black finish for extended longevity. Durable, used many times. 100% Satisfaction Guarantee: Providing the best products and services is our goal, if you’re not 100% satisfied with your tool, simply return it for a full refund in 30 days, no questions asked money back guarantee with 12 month’s warranty.