Dirty Water Bucket Is Designed For Use With Rubbermaid Wavebrake Combo. The Bucket Separates Dirty Water From Clean Water. Isolating Dirty Water Reduces Risk Of Cross-Contamination And Helps Produce Cleaner, Less Slippery Floors. The 18-Quart Bucket Divides Liquid Weight, Less Lifting Power Needed When Emptying Buckets.