MR. Aqua Plastic Check Valve

I've had these blue check valves for air pumps on a 46g and a 24g Nano for 6 months. these check valves DO have an arrow for easy setup. I haven't had any backflows after 6 months. The product works as advertised, and they are the best looking check valves available IMO. They especially look sharp on my aquarium with the black tubing.

The air valve that you receive does not have an arrow on it, therefore, you have no idea which way to place it on your tubing. Also, all packaging and writing is in Japanese. Not helpful, and not a good product.

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It's well made but nothing to write home about, especially at the high price. Also, it is clear (transparent), not blue as pictured. (I think that's the picture for the Hagen Elite brand)... Anyway, I'd recommend you find a "Elite"-brand check valve and NO other. They are the most durable, long-lasting, and well made. And affordable.

I gave it 5 stars because I'm reviewing the product not the price.

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wanted a check valve on my co2 system. Have one in place but you can be to safe. For the price I like that I can change it out every year or so as plastic is not recommended for Co2.

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Got this for an overflow I made, but it did not last and let air through--thereby breaking the seal in my overflow pipe. Ended up buying one in store from petco.