OE quality for reliable sealing Fits air-cooled & some water-cooled engines 24 required per engine assembly This OE-quality O-Ring is designed for the engine crankcase bolts on air-cooled engines, with 24 required per engine. It ensures a reliable seal to prevent oil leaks and maintain optimal engine performance. Also compatible with select water-cooled models for various sealing applications. Built to original equipment standards for durability and fit. .