A fire extinguisher which complies in all respects with the specification for portable fire extinguishers issued by the British Standards Institution numbered BS 5423; 1980 as amended by Amendment No. 1 (reference number AMD 4110 published on 31st December 1982) and Amendment No. 2 (reference number AMD 4544 published on 30th April 1984) and which—

1. (a)

   contains water with a minimum test fire rating of 8A, or

2. (b)

   contains foam with a minimum test fire rating of 8A and 21B, or

3. (c)

   contains, and is marked to indicate that it contains, halon 1211, or halon 1301, with a minimum test fire rating of 21B.