Rev-A-Motion Double 50 Qt. 4WCBM Series Bottom Mount Waste Units are the only bottom mounts available with the new Rev-A-Motion 8" Soft-Open, 8" Soft-Close Slide System. Innovative gas spring assisted shock allows the unit to open smoothly and close softly even under the heaviest use. New design allows for easy 5 screw installation into 1-1/2", 1-5/8", and 1-3/4" face frame sizes as well as frameless cabinets. *Minimum Opening Required: 17-3/8" Width. *Lids Sold Seperately