I needed valves to control the air in my phytoplankton plants. I installed a 4 bottle distributor but now I only have 2 bottles. Well the valves didn't stop the air flow completely so my 2 liter bottles didn't bubble, all air pressure escaped through the unused valves even though they were closed as tight as I could turn them. I will look for other valves. I see this is a common issue from other reviewers.
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