by means of a tube connected to the water mains

Full Title

Domestic plumbing installations for fresh water or waste water; Sinks > Plumbing installations for waste water; Basins or fountains connected thereto (drainage devices in floors E03F5/04); Sinks > Devices to facilitate removing of obstructions in waste-pipes or sinks > using fluid under pressure > by means of a tube connected to the water mains