The 12621505 Variable Valve Timing Camshaft Sprocket for Intake and Exhaust by ACDelco is a high-quality camshaft phaser designed for direct replacement in vehicles. Made from durable aluminum and steel materials, this camshaft sprocket features a 3-month manufacturer warranty and comes with a bolt included for easy installation. With interchange part numbers such as VVT524, 12578516, and 12621505, this camshaft sprocket is specifically designed for the exhaust position, ensuring optimal performance and efficiency in engines.