A mobile storage container has at least two compartments (11, 12), for use in transporting at least two fluids from main storage tanks to subsidiary storage tanks at other locations, the apparatus having a single fluid flow path (19) to deliver fluid, means (11c, 12c) to feed any one fluid along the flow path (19) and means (35) to clear the flow path of the first fluid, before a second fluid is sped along the flow path.