Rimless, Wall Hung, 4.5/3litres dual flush when used with the appropriate Conceala cistern Product Details Company Name Armitage Shanks Brand Name Contour 21 Model Number S3076 Maximum Flow Rate 3.38 litres Maximum Volume 4.5/3 litres Category WC Suites Available In United Kingdom Efficiency Rating Chart Company name:Armitage Shanks Model:S3076 3.38 litres 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.