Dual flush concealed cistern for back-to-wall WC’s. Factory set to default to 6/3 litres. Can be used with push buttons and flush plates. Product Details Company Name Geberit International AG Brand Name Sigma 12cm Model Number 109.309.00.5 Maximum Flow Rate 3.75 litres Maximum Volume 6/3 litres Category Cisterns Available In United Kingdom Efficiency Rating Chart Company name:Geberit International AG Model:109.309.00.5 3.75 litres