Washing basin for rooms with increased hygiene requirements, with:a basin-shaped sink (2) formed by a basin wall (3), and witha flow from a depth point (4) of the dip (2) (5),to which a drainage pipe (10) can be attached to connect to a sewage pipe, characterized by the fact that the pool wall (3) is one-off and has on the outside a flat connecting surface (9) adjacent to the sink (2), to which a sealing surface of the drainage pipe (10) can be attached and that the drain (5) is an arrangement that extends through the pool wall (3) straight down from the bottom point (4) of the sink (2) to the connecting surface (9).
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