Closed coupled WC white BTW Aquabladetechnology & Soft Close Seat Cover (without cistern)Product Details Company Name Ideal Standard International NV Brand Name Tonic II Model Number K3169 Maximum Volume 3.75 litres Category WC Suites Available In United Kingdom Efficiency Rating ChartCompany name:Ideal Standard International NVModel:K3169 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.