A wash basin mixer is a plumbing fixture used to control the flow and temperature of water in a wash basin or bathroom sink. It combines hot and cold water streams to provide a comfortable and adjustable water temperature for handwashing, face washing, and other personal hygiene activities.

 A wash basin mixer typically consists of a single handle or lever that allows the user to control both the water flow and temperature by moving it from side to side or up and down. The mixer is connected to the hot and cold water supply lines, and by adjusting the handle or lever, the user can achieve their desired water temperature. Some wash basin mixers may also include additional features such as aerators or water-saving technologies to enhance the water flow and reduce water consumption. Wash basin mixers come in various designs, finishes, and styles to complement different bathroom aesthetics and decor. They are commonly wall-mounted or deck-mounted, depending on the design of the wash basin. Wash basin mixers provide convenience, comfort, and control over the water flow and temperature, making them an essential fixture in modern bathrooms.