Como Fish Tank Aquarium Red Clear Plastic Air Pump Check Valves 5 Pcs

I never say that an item is worthless unless it is and these check valves were the worst things that I've ever purchased anywhere, anytime, ever. I have a commercial air pump and these check valves darn near made it stop pumping they're so bad.

When I tried to pull the air hose off these check valves to take them out, they came apart in two separate pieces. Useless! I wouldn't recommend these to my worst enemy. Well , maybe to worst enemy but no one else.

I wouldn't have given them one star but at least they arrived from Hong Kong.

This is a good device to use in conjunction with an air pump. I like the quality of construction and this is a very good price for 5 valves.

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I bought these and they are working as advertised after a month. the water has not once backed in at all.

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They get the job done and look pretty cool. I like the fact that they can prevent water from getting into your air pump if the power goes out.

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They work well and solved me an electrical problem when backflow of water shutdown my air supply pump. I recomend it to my friends.