Abstract: Apparatus for connection within a hose extending from a nurse tank assembly to a tractor mounted spray tank for utilizing a source of water under pressure within the hose from the nurse tank assembly to withdraw a chemical from a container and thereafter to clean the container in such a way that the chemical is mixed and delivered with the water utilized to the spray tank through the hose, said apparatus comprising a hose connecting unit, a portable unit, and a flexible hose assembly extending between the two units. The hose connecting unit includes a flow directing valve selectively operable to direct the water source (1) directly to the spray tank; or (2) through the portable unit. The portable unit includes a flow path having therein a flow control valve, a rinse water valve, and a venturi communicating with a chemical withdrawing conduit enterable within a chemical container, and a rinse water directing mechanism under the control of the rinse water valve cooperating with the chemical withdrawing conduit.