Concept Air close coupled bowl / back-to wall with Aquablade technology – horizontal outletProduct Details Company Name Ideal Standard International NV Brand Name Concept Air Model Number E079801 Maximum Volume 3 litres Category WC Suites Available In United Kingdom Efficiency Rating ChartCompany name:Ideal Standard International NVModel:E079801 3 litres www.uwla.eu The average flushing volume for dual flush WC Suites and Cisterns is calculated as (a + (3 × b)) ÷ 4, where a is the full flush value and b is the low flush value.