Air pump recommendations please?

[Bruce Leyland-Jones]

Wow, do you know what these things are called?

Amazon sold them as 'Air Pump Control Valves'.

 

[Essjay]

When I used an air powered filter in a betta's tank, I used one of those gang valves to bleed air from the system to reduce the flow going into the tank


They make them with 2, 3, 4 etc taps.