Wring bucket offers no-touch wringing of Microfiber mops (sold separately). "Washboard surface" effectively removes dirt and debris from mop pads before wringing. Twist-valve on bucket floor empties contents without lifting. Smooth, nonporous surface helps prevent bacterial growth and cleans up easily. Mobile bucket fits onto the Rubbermaid 6173 Janitor Cart and accommodates mop pads up to 18" in length.