Convenient graduated measurement marks on both clean and dirty water buckets allow user to see contents. Dirty water bucket separates and hides dirty water from clean water, preserving the quality and cleaning power of cleaning solutions. Designed to exceed 50,000 wringing cycles, while average wringers only perform approximately 860 cycles. Quiet casters are engineered to reduce noise and roll smoother, so workers won"t disturb guests and visitors. Made in the USA. Rubbermaid Commercial Executive Series WaveBreak Combination Mopping System, Side-Press, 35-quart, Black (1863896). Quick-view window easily helps the user see when it’s time to empty.