Abstract: A water purifier assembly mounted to a water supply outlet for selective dispensing of water through a general purpose outlet or a filtered outlet includes a filter assembly having a filtered water outlet and a feed inlet, a valve assembly having a water supply inlet connected to the water supply outlet, an open valve chamber with a water inlet communicating with the water supply inlet and sealing lands at opposite sides of the water inlet, an externally operable valve means reciprocally moveable from one side of said inlet to the other side of said inlet for sealing engagement with a respective one of said sealing lands, and outlets from said valve chamber disposed at opposite sides of said valve means and outwardly of said sealing lands and respectively communicating with the general purpose outlet and said feed inlet.