Rev-A-Motion Double 30 Qt. 4WCBM Series Waste Units are the only bottom mounts available with the new Rev-A-Motion 8" Soft-Open/Soft-Close Slide System. Innovative gas spring assisted shock allows unit to open smoothly and close softly even under the heaviest use. New design allows installation into 1-1/2", 1 5/8", and 1-3/4" face frame sizes as well as frameless cabinets. *Minimum Opening Requires: 20-3/8" *Lids Sold Seperately