This Pawfly 160 GPH Aquarium Air Pump is a piece of junk. I ordered it on amazon yesterday and received it this evening. Have to return it. Totally waste of time....
I guess you were talking about the manifold which usually is used for large air pump and each of its outlet has a valve to adjust its airflow. But the small 2 or 4 outlets air pump in this video is different. It doesn't have a manifold. Inside this kind of air pumps, each of its outlet has its own air chamber. All air chambers are powered by one solenoid. The airflow of outlets can only be adjusted altogether by changing the current of the solenoid via that knob in the video. I have returned this pump to Amazon and bought a Hydrofarm AAPA15L. The new pump works great.
when inside a down tube the wieght / pressure on the stone is less ,so try it again inside a down tube
You have three open air ports at the air pump that's why it's not working for you.
Did you adjust every nozzle?? They have adjustments too.
I guess you were talking about the manifold which usually is used for large air pump and each of its outlet has a valve to adjust its airflow. But the small 2 or 4 outlets air pump in this video is different. It doesn't have a manifold. Inside this kind of air pumps, each of its outlet has its own air chamber. All air chambers are powered by one solenoid. The airflow of outlets can only be adjusted altogether by changing the current of the solenoid via that knob in the video.
I have returned this pump to Amazon and bought a Hydrofarm AAPA15L. The new pump works great.