Used in Sprint Car and Midget applications where the Dry Sump Pump is mounted to the Front Cover. 1/2" hex accepts most Dry Sump Pump shafts; make sure your pump has a 1/2" shaft. Great for use on all Sprint Cars & Midgets, including Maxim, J&J, Eagle, XXX, JEI, Schnee, Shaw, Beast, Stealth, Spike, Bullet, Twister, etc. in almost all series, including World of Outlaws, USAC, ASCS, All-Star, OCRS, and many others.