This is the best bottle I have ever used.... This acts as a hand- held vacuum, sucking up the finest gold with ease. After filling the bottle with water, insert the lock tube and screw on the funnel tightly. Be sure the gold in your pan is covered with water. Squeeze the bottle and use the water jet stream to push the gold into the center. By releasing the pressure on the bottle, the suction will snuff up the gold through the tube into the bottle. Once in the bottle, the gold is trapped and the bottle can be used again. The bottle is 1 3/4" in Diameter and 6" tall with the sniffer tube out 3/4" as in the photo. Some bottles have the black insert seal and some have a white one.