The water block incorporates a mechanical water meter designed to automatically shut down the mains water supply to avoid flooding. There is no need for electricity. It is easily installed via standard 3/4" BSP water connection and can be pre-set from 5 to 50 litres. An external resetting device is also available. Typically used for free standing appliances such as washing machines, glass washers, clothes washers, coffee brewers, vending machines, ice makers and dish washers.