Penn-Plax Air Tech Plastic Aquarium Valves
Air Tech 4 Outlet Gang Valve

Visual Air Regulating Valve

Flow control meter.
Safe, anti siphon feature.
Adjustable universal hanger.
Accurate visual controls - gives instant feedback of air flow.
Convenient flip cover - protects against mineral build up.
Extra input/output - allows connection of additional pump or valve.
Non corrosive - all plastic construction.
Suitable for both fresh and salt water applications.