Paragraph 9
The outside of the extinguisher shall be clearly and permanently marked with:—
(a)
the name of the maker or vendor of the extinguisher;
(b)
the capacity of the extinguisher;
(c)
the level of the solution, when the extinguisher is filled to its working capacity;
(d)
the pressure under which the extinguisher was tested;
(e)
instructions for operating the extinguisher;
(f)
the year in which the extinguisher was manufactured.