An improved fluid mixing device comprising a mixing chamber having end walls and a cylindrical side wall. A first fluid conduit joins the mixing chamber at a first port formed in the first end. A second fluid conduit joins the mixing chamber at a second port formed in the side wall. A second fluid conduit is angled with respect to the mixing chamber to direct fluid flow from the conduit through the second port generally along the wall of the mixing chamber to create a rapid vortexing action. A third conduit joins the mixing chamber at a third port in the second end. A fourth conduit intersects the third conduit, the center lines of the third and fourth conduits offset at the area of intersection.