500 cu ft Exemption Special Permit Cylinder – 3/4″-14 NGT Inlet 500 cu ft Exemption Special Permit Cylinder - 3/4"-14 NGT Inlet quantity Add to cart Add to Quote SKU: 500STEEL Categories: Breathing Air Cylinders, Compressed Gas Cylinders Capacity 491 cu ft / 13903.6 l Diameter 9.41" / 239 mm Height 50.5" / 1282 mm Material Steel