An apparatus for rinsing inverted chemical containers includes two main assemblies, namely a gravity flow valve assembly and a rinse adapter assembly. The gravity flow assembly is inserted into the throat of the container. The rinse adapter assembly is detachably secured to the throat of the inverted container. When the rinse adapter assembly is attached to the throat of the container, the rinse tube of the rinse adapter assembly extends upwardly through the gravity flow valve assembly and into the interior of the container. Rinsing fluid, such as water, is supplied to the rinse tube which sprays the rinsing fluid onto the interior of the container to rinse the chemical residue from the interior of the container. The apparatus may also be used to dilute the liquid chemical in the container so that the diluted chemical will more freely drain from the container.