The Duravit Dual Flush, Slimline Concealed Cistern for Wall Hung Pan WD1021000021 is a slimline in-wall cistern with a solid metal frame, and the perfect accompaniment to any Duravit wall hung toilet pan. Suitable for Duravit A1 flush plates, the DuraSystem in-wall cistern hides away in the wall cavity, allowing the bathroom to really shine.