The friendliest place on the web for anyone with an interest in aquariums or fish keeping!
If you have answers, please help by responding to the unanswered posts.
if you buy a big enough air pump...you run a siingle air line to these green valves..then you can run 4 seperate air lines at one time...and can also shutoff/run different ones aat the same time..
That's the beauty of the gang system. Run the one airstone thru one channel of the gang and close down the other valves. When you acquire more tubing and stones attach them!