Air tends to go to the point of least resistance, so if one airstone is shallower than others are, or has a shorter air line, it will get the majority of the air. Selector Valves allow you to regulate the airflow. The folks at Outdoor Water Solutions use high-quality brass ball valves, which are designed to stand up to-years of use. 1/2" male fittings where polytubing attaches. Made in U.S.A.
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Outdoor Water Solutions® 3-way Selector Valve
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