Abstract: A sink shampoo unit that includes a spray head assembly that is removably attachable to a faucet in a sink, and the assembly providing manually operable means for injecting a metered quantity of a liquid shampoo into water discharging from the spray head during the shampooing operation. The spray head assembly when not in use is removably disposed in a container. The container is of such shape that when the spray head assembly is used, the container may serve as a drain board to direct water used in washing the hair back into the sink, when the container is angularly disposed in the latter.