Efficient and modern in design. Anti-siphon/backflow design prevents contamination of fresh water supply. Adjustment rod raises/lowers water level for ideal flush volume in any cistern. Durable parts stand up to years of flushes. Narrow profile allows a proper fit in slimline WC cisterns (no adjustment needed). Fits any cistern/storage tank. Absence of lever arm prevents tank wall distortion, making support structures unnecessary.