# Motor Vehicles (Construction and Use) Regulations (Northern Ireland) 1999, Paragraph 4: Unions


(1) A union shall be so constructed and fitted that it will—
(a) not be liable to work loose or develop leakage when in use; and
(b) be readily accessible for inspection and adjustment.
(2) A union on a pressure pipe line or on a gas cylinder shall not contain a joint other than a metal to metal joint.

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