55 cu ft Steel Nitrogen Argon Helium Cylinder with CGA580 Valve – Cap + Collar 55 cu ft Steel Nitrogen Argon Helium Cylinder with CGA580 Valve - Cap + Collar quantity Add to cart Add to Quote SKU: 60-STEEL Categories: Compressed Gas Cylinders, Nitrogen/Argon/Helium Cylinders Capacity 56.2 cu ft / 1591.4 l Diameter 7" / 177.8 mm Height 22.5" / 572 mm Material Steel Service Pressure 2015 PSI / 139 Bar