K4 More freedom in your daily kitchen tasks. The essential complement to commercial-grade kitchen appliances, the K4 dual-spray pull-out faucets for main and prep sinks offer chef-worthy tools that will appeal to people who are both serious about cooking and serious about creating a beautifully functional kitchen. The K4 spray head is comfortable in your hand meeting the latest ergonomic research findings, while variable body positioning allows the faucet handle to be placed conveniently for optimum functionality. Each also features the smooth, precise action of Grohe SilkMove® technology and the patented SpeedClean® anti-lime system which maintains a like-new spray function with a simple wipe.