The Square Support Rod is a modular support system for 3Dponics tubing. Feed your rubber tubing through the hollow rod to ensure that the water or nutrient solution flows smoothly through your system. It also ensures that the conduit or venturi is positioned vertically in the nutrient solution so that it can suck up the water efficiently. Visit our website (https://www.3dponics.com) and join our Google+ community (https://plus.google.com/u/0/communities/111638904033818784 Want to print this part? Search today's top 3D-printing services and materials to find the cheapest price for your project. Go to https://www.3Dprintler.com260)!3D Printing Settings: -Low quality; 0.2 mm; 2 shells; 10% infill Tested on MakerBot, Ultimaker, M3D Micro and Formlabs