# Motor Vehicles (Construction and Use) Regulations (Northern Ireland) 1999, Paragraph 6: Valves and cocks


(1) A valve or cock intended to be subjected to a pressure exceeding 6.8948 bar shall be of forged steel or of brass or bronze complying with the specification contained in Part II of this Schedule.
(2) A valve or cock shall be fitted to the pipe line to enable the supply of gas from the container to the mixing device to be shut off.
(3)(a) In the case of a pressure pipe line the valve or cock shall be placed between the reducing valve and the container and shall be readily visible and accessible from the outside of the vehicle and a notice indicating its position and method of operation shall be affixed in a conspicuous position on the outside of the vehicle carrying the gas container.
(b) in other cases, if the valve or cock is not so visible and accessible as aforesaid, a notice indicating its position shall be affixed in a conspicuous position on the outside of the vehicle carrying the container.

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Source: https://www.legislation.gov.uk/nisr/1999/454/schedule/4/paragraph/6 (the official version)
Page: https://openlegislation.uk/motor-vehicles-construction-and-use-regulations-northern-ireland-1999/schedule-4/paragraph-6
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.