Inlet / Outlet Size: AN-10. Made with High Quality T-6061 Aluminum. Potentially Reduces Oil Temperature up to 50F. Powder-Coated and Oxidized for Durability and Protection. Helps Reducing Coolant Temperature and Extends Engine Life. Excellent for Modified Street Vehicles, which are Driven Hardly with Minimal Track Use. Professional Installer is Highly Recommended (No Instruction Included). AN FITTING&NYLON HOSE LINE SIZE: