Abstract: An improved liquid flow diversion arrangement for use with an additive dispensing system in an automatic washer. Included is a liquid flow diverter of the transverse pressure differential type having control ports coupled to atmosphere by tubes whose open ends terminate at the machine sequence control timer. Means are provided associated with the timer for closing the open ends of the tubes and thereby the control ports at predetermined times to effect liquid flow diversion. A check valve is provided at the outer end of each control port for preventing liquid from escaping from the fluid diverter. A chamber is coupled by a segment of the tubing between each control port and the timer for accumulating liquid that may bypass the check valves and further, for preventing audible sonic oscillations which may occur in the liquid flow diversion arrangements due to the inherent ability of the diverter to amplify resonance in the system.