Valves while using multiple diffusers
Why do you need a 2-way or 3-way valve when you’re running multiple diffusers?
Air will always go to the point of least resistance. If one diffuser is a little shallower or has a shorter airline, it will want to take most of the air. You’ll have to restrict the airflow to this diffuser with a valve system so that air is forced out of your other air stones.