Close Couple Bowl, white, & Soft Close Seat CoverProduct Details Company Name Ideal Standard International NV Brand Name Tesi II Model Number T3563 Maximum Volume 3.38 litres Category WC Suites Available In United Kingdom Efficiency Rating ChartCompany name:Ideal Standard International NVModel:T3563 3.38 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.