Pen Plax VAT35 Air Tech 3-Outlet Air Control Valve for Aquariums Reliable multi-outlet air valves let you organize & control multiple aeration accessories Accurate dial controls with easy to read flow gauges control each line independently Extra input/output allows connection you to add additional pumps or valves Barbed connections & anti-syphoning keeps lines connected and your air pumps safe Made of a durable plastic that will not corrode