The Fluidmaster AIRGAP 6000 is a water-saving fill valve designed to fit virtually all bottom entry cisterns. It features a unique AirGap technology that eliminates backflow, negating the need for an additional check valve. This valve complies with BS 1212-4 standards. The delayed fill action saves up to 1 litre of water per flush. Installation is toolless and height-adjustable, allowing for water levels between 140mm and 240mm. It offers quiet refilling due to a spiral flow vortex generator and performs optimally across a range of water pressures.