Aluminum air reservoirs Tooled for following diameters up to 58" in length 5, 6, 7, 8, 9, 9.5, 10, 12 Available in other diameters --ask us Custom built to your specifications and applications Single and multiple compartments with or without check valve Aluminum trailer tank Natural, polished or painted Module assemblies End and body brackets We welcome any design questions or inquiries for all diameter tanks from 3.5" to 12"