The Stainless Steel 4 In Diameter 90 Degree Elbow Pipe (GR-L490-1818S4S) is a practical and reliable product. With an 18-inch OD/OD, it fits most makes and models. Made from 409 stainless aluminized and 14-gauge material, this pipe is durable and long-lasting. It does not have a bright finish, making it suitable for various applications. Available in 4-inch ID/OD or OD/OD, it offers flexibility in installation. With a 12-inch length on each side and a 4.5 center line radius, this elbow pipe provides efficient and effective performance. Sold individually, it is a valuable addition to any project.