Unit is comprised a hopper and a plunger. The hopper is placed on the balance, the weight is tared, and the compound is weighed into the hopper. The plunger is inserted, the unit is inverted, and the tube is attached. The compound is pushed up into the tube, avoiding the large open end of the tube to ensure a quality seal. Purchase of the Tube Filler Adapter #16 (#35-2593
) is required to use this Tube Filler for plastic tubes with a #16 opening.