WALL-HUNG WC with DUAL FLUSHING SYSTEM Product Details Company Name Hidra Ceramica SRL Brand Name DIAL Model Number DL12 Maximum Flow Rate 4.5 l/min Maximum Volume 6/4 litres Category WC Suites Available In United Kingdom Efficiency Rating Chart Company name:Hidra Ceramica SRL Model:DL12 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.