The Grand Rock Adapter is a practical and efficient solution for those looking to connect a 4-inch OD to a 4.61-inch flare turbo or manifold. Made with aluminized material, this adapter is designed for use with 3306 Cat and most 6 cylinder Macks, and can be used with the V-Band Clamp #VB-461M Breeze: VT10461. Measuring 4" OD x 4.61" x 4", this adapter is sold individually and fits most 3306 Cat models and most 6 cylinder Macks. Its practicality and compatibility make it a must-have for those in need of a reliable adapter.