Sandringham 21 Smooth close coupled WC bowl – Horizontal outlet Product Details Company Name Armitage Shanks Brand Name Sandringham 21 Model Number E822101 Maximum Volume 2.95 litres Category WC Suites Available In United Kingdom Efficiency Rating Chart Company name:Armitage Shanks Model:E822101 2.95 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.