The purpose of this standard is to establis the connection characteris ics of wall-hung WC bowls with direct flush and adjoining cis ern. whatever the materials used in their manufacture. It does not relate to siphonic suction basins, NOTE Only the dimensions of the dimensioned parts must be respected, The schematic shape of the devices shown in dashed lines on the sketches is given for a better understanding of the drawings; it in no way prejudges the final form of the devices which is left to the initiative of the manufacturers.
NBN B 31-004-1978 history
1977NBN B 31-004-1978 Suspended water closet, direct flush, adjacent cistern, connection dimensions