"this product is pretty easy to use. i've never had any air pump set up in my tank before, so this was the first time. i got this product mainly because of the other reviews i read on here.
it is easy to work and regulate the air going in. one of the main reasons why i bought this was because of how you can completely shut it off. good thing for when you want to feed your fish and don't want the current or bubbles getting in the way, or when you're cleaning the tank. just close it off from this valve instead of having to plug the pump off.
the cool thing about it too is it has the multiple valves for multiple lines. if you want one off and the other one on or high, low whatever, this is great for that."