The Dux Vienna Cistern and Seat pack has a 4 star WELS rating with a 4.5L full flush and 3L half flush, adjustable to 6L full flush. Vitreous China Polypropylene construction of the cistern offers added strength. Chrome dual flush buttons make it easy to use. Quick release function of the hinges facilitates easy cleaning and removal. Wall clip can be adjusted to make installation simpler.