Roca's latest brassware range is the water-efficient, single-lever mixer Singles-Pro.  Not only does it have a water flow limit of 9 litres per minute - a saving of 25% when compared to standard single lever tap designs - it also contains a progressive cartridge which offers a new technology in Roca taps.  The cartridge control always starts the flow with cold water, and as the control is continually turned this is followed by a mix of hot and cold and ends with hot leading to significant energy savings.