Abstract: The present invention relates to an efficient method of automatically and sequentially intravenously administering two separate solutions to a patient by utilizing a Y-type IV set provided with a single drip chamber monitoring station disposed below from a Y-connecting point. Solution from a first container is directed through a first leg, a Y-connecting point and a single drip chamber monitoring station. A portion of this first solution is operative to engage a check valve interposed within a second leg leading from a second solution container to the Y-connecting point. This engagement causes the check valve to close and prohibits flow of solution from said second container to the Y-connecting point. Once the first solution container has emptied, the check valve is deactivated, and solution from the second container can automatically in sequential fashion move to the Y-connecting point.