oli120 plus mechanical direct concealed dual flush cisternThe OLI120 PLUS Mechanical Direct concealed cistern (code 885049) is a dual flush toilet installation system designed to be concealed within the wall and compatible with floor mounted toilets . It is ideal for installations in masonry or brick walls , offering an efficient, reliable solution compatible with various flushing mechanisms. CHARACTERISTICS Adjustable dual flush: 6 3 L (can be adjusted to 4 2 L or 7 3 L) for water saving and optimized