Best viewed on a computer or in landscape mode.
These attachments are meant to aid with high gold recovery when dealing with powder dirt, usually resulting from crushed ore.
With the top attatchment extending the hopper port drain into the trap, all the dirt is forced into the trap. It is then surrounded by a column of water that further forces the material to the bottom of the trap.
When running the Dual Nano system, this setup can only be used on the first one. This setup will require a very low flow rate as well, there are USB motor controllers available to achieve the required flow rate. The proper flow rate may vary but Ideally the trap should stay full of material while its running. If the trap clears out with very little dirt remaining then the flow rate may be to high.