-Compatible with all Mercio Wall-Faced Floor Pans -WELS 4 Star 4.5L/3L. -The cistern's tank is made of high-density, impact-resistant, one-piece blow moulded HDPE, guaranteeing leak-proof performance. -The dual-flush plate allows easy access for servicing the internal components of the cistern. -It is suitable for S or P trap back to toilet pans. -The operating pressure range is 10-1000kpa. -The cistern is designed to fit standard 90mm walls. -Compatible with all mechanical and pneumatic Sigma buttons available in Australia