The back drain-plug allows to keep rinsing water always clean without emptying the detergent solution. Compact in its dimensions. Thanks to the removeable hermetic central bulkhead, it keeps the cleaning solution separate from the rinsing water.   The back-drain plug avoids lifting the bucket for emptying.  Higher than the traditional buckets, it allows the operator to work while standing.  Design, elegance, functionality and security.  Non-rusting and ecological because entirely recyclable.  Being fitted with the O-Key bottomless squeezer, it allows rinsing and squeezing operations to take place separately from the detergent solution.  Wide bucket capacity: 30 Lt. It resists blows, is indestructible and therefore reliable. The double handle makes it balanced during the transport. Handy thanks to its castors 80 mm diameter. Being fitted with the O-Key bottomless squeezer, it may be used with mops as well as with Wet-System tools. Practical and handy, it cuts working time. Saving of the detergent solution implies fewer costs.