Description: Genuine GM Camshaft Sprocket O-Ring, part number 12574477. This GM OEM camshaft sprocket o-ring seals the joint between two components to prevent fluid, air or exhaust leaks. Made by General Motors to original equipment standards for correct fit, finish and durability—no guesswork with aftermarket parts. Verify fitment using your VIN or GM part number 12574477 before ordering. Shipped from Gateway Buick GMC, an authorized GM dealer.