Paragraph 3

The extinguisher shall be provided with a discharge hose which shall be reinforced so as to withstand a pressure of at least 122.5 kilogrammes force per square centimetre when the necessary couplings are fitted. The bore of the discharge hose shall not be less than the sizes respectively set forth in the following table:—

The discharge hose shall be provided with a horn which shall be of electrically nonconducting material and of a design which will reduce the velocity of the gas discharged. The metal part of the operating handle shall be suitably sheathed to protect the hands of the operator from extreme cold.