Steel 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 Module assemblies End and body brackets Porcupine tank We welcome any design questions or inquiries for all diameter tanks from 3.5" to 12"