Air Check Valve by TOM Aquarium Products cleans air and prevents water back-up.
Questions on Air Check Valve by TOM Aquarium Products
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great check valve Review by Vi
i use it to connect the air intake between my protein skimmer and a carbon dioxide scrubber. don't need to keep the air intake on my protein skimmer elevated any longer because the check valve would prevent water from flowing back (Posted on 1/25/2017)
Does its job. Review by Derek
Heck, its a check valve. Air goes one way, and not the other. (Posted on 2/3/2015)