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The drain valve is intended for washbasins and fits in standard dimension 1 ¼''. It works both on basins with and without integrated overflow. The chain has an attachment that fits in basins with "chainstay". This means that the washbasin is prepared with a small hole for attaching this type of chain. If there is no chainstay in the basin, the fastener can be removed.
For detailed measures see picture 2 above to the right.