Wall hung 4.5 litres single flush when used with the appropriate Conceala cistern Product Details Company Name Armitage Shanks Brand Name Sandringham 21 Model Number V3910 Maximum Flow Rate 4.5 l/min Maximum Volume 4.5 litres Category WC Suites Available In United Kingdom Efficiency Rating Chart Company name:Armitage Shanks Model:V3910 4.5 l/min 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.