43. Closets, urinals, lavatory basins and sinks

No motor vehicle or trailer shall be equipped with any closet, urinal, lavatory basin or sink, unless the following requirements are complied with:

no vehicle shall be equipped with a closet or urinal the contents of which can be discharged directly on to a road and every closet pan or urinal pan shall empty into a tank carried by the vehicle such tank —

being efficiently ventilated by means of a pipe, the outlet of which is outside the vehicle; and

shall contain non-inflammable and non-irritant chemicals of such character and in such quantity as to form at all times an efficient deodorant and germicide in respect of the contents of the tank; and

no lavatory basin or sink shall drain into any closet or urinal or into a tank into which a closet or urinal empties.