This concealed toilet cistern has been specially designed to have a water saving tank that reduces the flush for back to wall toilets. With its water conservation properties each hidden cistern can reduce the water consumption by up to 33% compared to a standard cistern. With a dual flush, this concealed cistern conserves water on the main flush by using only 4 litres instead of 6 litres and 2.6 litres on the half flush instead of the standard 3 litres. Available with the choice of 24 designer flush plates."extremely reliable cisterns"