A typical basin tap or shower running at mains pressure can easily deliver 20 litres per minute or more. The easiest way to save water with existing basins and showers is to fit a flow regulator. In-line flow regulators save water by limiting flow in the supply pipe. Regulators are available for 15mm or 22mm pipes and have a cartridge which limits the maximum flow to 4/6 litres per minute (basin) and 9/6 litres per minute (shower). The three settings on the valve permit full flow, use as an isolation valve for servicing , or the water regulating function.