I am very happy with it. I used to have problems with blood pressure. I discovered my problems before the one-way valve cut off the suction. This 4-way valve features a built-in anti-siphon valve and offers excellent airflow. The only tricky part is the mini valve which is a little tricky to adjust but once you get it where you want it you're done. I only use two ports and on the other two I just reset the airflow. It hangs beautifully in the back of my 72 gallon tank.
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