Never been this happy to recieve a package in the mail. This is a random flow generator return nozzle. It has no moving parts, and generates random flow from its design. My redsea return points toward my front pane, with a constant stream at about 1,100 gallons an hour. Some of my acros on my frag rack, have flat sides to them due to the constant pounding they take from the return stream. Now with this adaptor and 2 nozzles i can eliminate it all together, along with some random flow. The adapter is designed to snap onto the fitting on the redsea reefer tank. So actually is aesthetically pleasing, instead of bulging out like everything else myself and others tried. This product is a game changer, i will post a video sometime soon. But i suggest anyone that sees this, give youtube a search for rfg nozzle. Considering the cheap price its a no brainer. Thank you antonio!