904 (F54/120) Heavy Duty Waste Disposal Unit.904 (F54 120) Heavy Duty Waste Disposal Unit. The 04 Series Food Waste Disposers provide the ultimate heavy duty solution for processing higher volumes of food waste in kitchens handling from 1000 up to 1850 covers per sitting. Designed for use in large hotels and restaurants, hospitals, prisons, universities and by food preparation companies, the 04 Series can handle difficult waste including fish skins, cauliflower stalks and larger meat bones.