Twelve Valves Is the Point of the 12 Outlet Copper Air Divider
A splitter divides air. A divider with valves lets you decide where it goes. Each of the twelve outlets opens and closes on its own. A bucket bubbling too hard gets throttled back, and an empty station gets shut off rather than bleeding air the rest of the row needs. Input takes 3/8 in internal diameter tubing from the pump and each output runs 0.17 in internal diameter line to the stone. Copper body rather than plastic, which matters because valve stems in a plastic manifold strip.
Matching an Air Pump Manifold to What Your Pump Actually Makes
Here is the part people get wrong. A manifold does not create air, it only divides what arrives. Twelve outlets off a pump rated for four stones gives twelve weak lines rather than twelve good ones. Check the pump output in litres per minute against the stone count before splitting this wide. Twelve earns its place on a long DWC row or a bank of cloners, where individual control beats running separate pumps. Mount it above the water line so nothing siphons back into the pump if the power drops. Close the valves you are not using. An open outlet is the path of least resistance and steals pressure from every stone downstream. One pump and one manifold also means one power cord to worry about instead of four. Keep a spare length of airline on hand, since trimming to length is easier than stretching.
Key Features
- Twelve individually valved outlets: Throttle or shut any single line without disturbing the other eleven stations on the manifold.
- 3/8 in internal diameter input: Takes the standard pump line size, so no adapter stack between pump and manifold.
- 0.17 in internal diameter outputs: Matches common airline tubing running out to stones and diffusers.
- Copper body: Holds valve threads better than a plastic manifold, which is where budget dividers fail first.
- Individual control on one pump: One pump and one manifold instead of several pumps for a long DWC row or a bank of cloners.
Technical Specifications
| Specification | Value |
|---|---|
| Outlets | 12 |
| Valve Control | Individually adjustable, each outlet opens and closes separately |
| Input Tubing | 3/8 in internal diameter |
| Output Tubing | 0.17 in internal diameter |
| Body Material | Copper |
| Mounting | Above the water line to prevent back-siphon |