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Typical markings for a SCUBA cylinder according to PED

Cylinder markings


  1. M25 x 2 = Thread Specification - Important to ensure the correct valve is used with your cylinder.
  2. UK = Country of Manufacture
  3. LUXFER = Cylinder Manufacturer
  4. P3173V....= Cylinder Type Number and Serial Number - This number is recorded by Luxfer which means, if ever necessary, the entire manufacturing history of your cylinder can be traced.
  5. AA6061 T6 = Alloy of Construction
  6. 11,6MM = Design Minimum Wall Thickness.
  7. 9,8KG = Empty Weight of Cylinder Only (kg)
  8. 7L = Minimum Water Capacity (litres)
  9. PW 232 BAR = (Working Pressure) - Shows the pressure that the cylinder should be filled to - this must not be exceeded.
  10. PT 348 BAR = (Test Pressure) - Shows the pressure that the cylinder should be tested to - this must not be exceeded.
  11. PS 287 BAR AT 60°C = (Service Pressure) - Shows the maximum service pressure and operating temperature for which the cylinder design is approved. This must not be confused with the working pressure (9).
  12. This is the mark of Conformity and Notified Body Reference Number according to the Pressure Equipment Directive 97/23/EC.
  13. 2002/ 2 = (Test Date) - Year and Quarter of year of initial test.
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