The Grand Rock Adapter is a practical and versatile solution for turbo and manifold connections. With its 3.5-inch OD to 4-inch flare design, this aluminized adapter is specifically designed for Detroit Diesel applications. Measuring 3.5" OD x 4" x 6", it fits most Detroit Diesel models effortlessly. Its durable construction ensures long-lasting performance. Sold individually, this adapter offers a reliable and efficient connection for your turbo and manifold needs.