Closed coupled WC white, Aquabladetechnology (without seat & Cover)Product Details Company Name Ideal Standard International NV Brand Name Tonic II Model Number K3161 Maximum Volume 3.75 litres Category WC Suites Available In United Kingdom Efficiency Rating ChartCompany name:Ideal Standard International NVModel:K3161 3.75 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.