Check the listing for details. Random Flow Generators for Loc-Line. Condition: New. Listed at 9.90 USD. Random Flow Generators for Loc-Line 3D printed random flow generators easily snap onto standard Loc-Line segments for a custom flow pattern. Each RFG is made of reef-safe PETG plastic and made to outlast your aquarium. Just snap the adapter end onto either 1/4", 1/2" or 3/4" (PLEASE SELECT CORRECT SIZE) loc-line and within seconds you can direct the nozzle with the traditional ball and socket style. Design uses a set of 4 fins in a spiraling design that channels the water in from one direction at the base of the eductor and then out of the nozzle a different direction. The small amount of interference at the base of the eductor helps create a random change in the intake affecting the path of the flow exiting the nozzle.All my products are print and ready to be ship out, you don't have to wait.