An apparatus for washing hands may have a chamber having a water outlet and a vessel at least partly in the chamber. An axle extending into the chamber is configured to attach to the vessel such that the vessel rotates relative to the axle to pour water out of the vessel and into the chamber. The vessel has a valve mechanism configured to close a valve and thereby block further entry of water into the vessel when a water level in the vessel reaches a certain level, for example when it exerts an upward force on a float. A water inlet delivers water to or into the vessel through a vessel wall to the valve and is configured to allow a constant flow of water into the vessel until the water inlet is closed by the valve mechanism. In some embodiments without a chamber, water drains external to the apparatus.