coredy robot vacuum replacement water tank reservoir with cloth mop for r500,r550(r500+),r750,r580, g800, g850 robot vacuum cleaner-300ml(1pc) coredy high volume 300ml water tank, great for wet and dry mopping on hard surface floors, such as hardwood, linoleum, porcelain and vinyl and others, compatible with r550 r500+ r500 r750 r580 g800 g850 robot vacuum cleaner.