Active Aqua 12-Outlet Metal Air Manifold

Yes, as long as your pump uses 3/8" ID output tubing on its outlet — the standard size for larger-format air pumps including the Active Aqua Dual Diaphragm models (for which we also carry replacement diaphragms) and 12W 8-outlet models. Smaller pumps using 1/4" output tubing would require an adapter to connect to the manifold's 3/8" input. Confirm your pump's outlet tubing size before ordering to ensure a direct connection.

Yes. When outlets are closed, the pump's total output is redistributed across fewer open lines — increasing the airflow available to each active outlet. This is useful for systems that don't need all 12 sites running simultaneously, or for temporarily boosting aeration to specific reservoirs without adjusting the pump's pressure dial. Keep in mind that closing too many outlets can increase back-pressure on the pump beyond its rated operating range.

Each outlet is sized for 0.17" internal diameter airline tubing — the same ID as standard Active Aqua clear vinyl tubing used throughout the Active Aqua air stone and aeration accessory lineup. No adapters are needed to connect directly to standard ¼" OD hydroponic airline tubing at each outlet.

Yes — inline check valves on each outlet line are strongly recommended whenever the pump and manifold are positioned at or below the reservoir waterline. A power interruption without check valves can allow nutrient solution to back-siphon through multiple open outlet lines simultaneously and into the manifold and pump body. With 12 outlets in use, the potential for back-siphon damage is compounded — check valves are a standard and essential addition to any multi-outlet aeration installation.

The manifold is constructed from copper and stainless steel — both of which offer corrosion resistance in humid grow room environments. However, direct submersion in saltwater or high-concentration nutrient solution is not recommended for copper components, as prolonged exposure can cause gradual degradation. The manifold is designed for air distribution above the waterline, not for direct contact with solution in your Active Aqua reservoir.

The manifold's compact 9.5" × 1.5" profile makes it easy to mount on a wall, bench frame, or reservoir edge above the waterline using standard zip ties, clamps, or mounting brackets. Positioning it above the waterline is important both for preventing solution contact with the metal components and for ensuring that check valves on the outlet lines can function correctly to prevent back-siphon during power interruptions.