# The Road Vehicles (Construction and Use) Regulations 1986, Paragraph 4: Unions

Extent: E+W+S

(1) Every 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) No union on a pressure pipe line or on a gas cylinder shall contain a joint other than a metal to metal joint.

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Source: https://www.legislation.gov.uk/uksi/1986/1078/schedule/4/part/I/paragraph/4 (the official version)
Page: https://openlegislation.uk/road-vehicles-construction-and-use-regulations-1986/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.