Specification for WC flushing cisterns (including dual flush cisterns & flush pipes) Flushing cisterns, Dual-flush cisterns, Sanitary appliances, Siphonic WC pans, Pipes, Ceramics, Plastics, Volume, Marking, Design, Thickness, Deformation, Opacity, Position, Width, Test pressure, Instructions for use, Flow measurement, Flow rates, Mechanical testing, Impact testing, Test equipment, Pipe connections