O2 Medical Steel Cylinder the specifications from left to right are Water Capcity 3L 5L 10L 15L 21L Liner Diameter 108 120 140 203 159mm Below specification are all for standard sizes, we can also supply you non-standard cylinder if you want. High Pressure Seamless Steel CylindersSerial No.TypeNominal working Pressure(Mpa)Water test pressure(Mpa)Volume(L)Nominal Outer Dia.(mm)Length(mm)Weight (kg)1WMA140-4-15152541403957.42WMA140-5-15152551404508.23WMA140-6.3-1515256.31405409.44WMA140-8-151525814068511.45WMA140-10-1515251014084513.46WMA159-8-1515258159545117WMA159-10-15152510159675138WMA159-15-15152515159955199WMA219-20-151525202197302910WMA219-25-151525252198853311WMA219-32-1515253221910904012WMA219-40-15152540219131048 No.1-No12 Material: 34CrMo4 No.1-No12 According to standard: GB5099 EN1964