A check valve is used to prevent water from siphoning out of your aquarium. If water siphons out, it will usually damage the air pump and...
Reviews
4.9
56 ratings
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Works well.
Xavier · May 18, 2026
Functions properly, my only recommendation would be to add an air flow designator on the casing. Though i have figured the slight taper inside indicates flow direction, i still end up blowing through it to be sure.
B
Brian · February 18, 2026
Not sure why but all my check valves whistle and make an annoying noise.
