Abstract: The water mixing valve is provided with a housing insertable in a sanitary fixture. The housing is made of a cuplike casing and a base member having a plurality of throughgoing water passages. The mixing valve has a valve seat disk held fixed in the cuplike casing and a control disk movable with an operating member. A sealing member made of elastic rubber material is positioned in each of the water passages for sealing the valve seat disk and the sanitary fixture. To simplify the sealing member construction and particularly their mounting in the mixing valve each of the sealing members is undetachably attached in the vicinity of the opening in the wall of the base member for one of the water passages.