Innovative Fill-Rite™ design eliminates looking for the fill line - simply fill Rapi-Kool® Plus with water, screw on the top and freeze. Separate handle/cap guarantees ice expansion area. Helps to rapidly chill food through the temperature danger zone (135°F to 70°F) in 2 hours, then to 41°F within 4 hours. Cools product from the "inside out," so products chill faster and more evenly. Smooth exterior makes it easy to clean. Durable polycarbonate construction is dishwasher safe, and is the best material to stand up to freezing–heating cycles. NSF.