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. 
- 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.
Typical markings for a SCUBA cylinder according to PED
Thursday, 21 November 2002