Current Culture EZ Clean Return Manifold for UCXL13 SystemsNew CCH2O EZ Clean Return Manifolds For Current Culture UC Evolution systems. Just pick your system size! Note: For Double Barrel models, use (2) UC return manifolds for your appropriate sized system. FEATURES Efficient manifold cleaning and maintenance Quick and easy assembly and expansion Multiple plant spacing options Reinforced design Professional greenhouse grade UV stabilized Solid ABS construction Manufactured in California Recyclable Included