305 High, Close Coupled 4/2.6 dual flush with delayed action fill valve Product Details Company Name Armitage Shanks Brand Name Contour 21 Schools Model Number S3046, S3694 Maximum Flow Rate 2.95 l/min Maximum Volume 4/2.6 litres Category WC Suites Available In United Kingdom Efficiency Rating Chart Company name:Armitage Shanks Model:S3046, S3694 2.95 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.