Close coupled, 4 litres single flush with delayed action fill valve Product Details Company Name Armitage Shanks Brand Name Sandringham 21 Model Number E8963, E8968 Maximum Flow Rate 4 l/min Maximum Volume 4 litres Category WC Suites Available In United Kingdom Efficiency Rating Chart Company name:Armitage Shanks Model:E8963, E8968 4 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.