Como 5pcs Plastic Non-return Aquarium Air Pump Check Valves

These worked as desired in my 1/4-in air tubing; however, I had to take a razor and trim plastic tags that were left over from manufacturing. Not that big of deal, there it is.

I'm using these for a hydroponics application, and most of them work. I've had a couple that wouldn't let air through altogether, and it took me a second to realize the failing connection was one of these check valves.

That's just bad QC. Most of the valves I received weren't defective.

Of the working valves I received, I connected one to a deep water culture (for air bubbles) and the weight of the nutrient solution went right through the valve and backed up the airline (heading towards the air pump). Needless to say the air flow stopped. People use check valves so these kinds of things don't happen.

Also, the fittings on each side must be larger than 1/4", because these valves stretch out my 1/4" airline. After I was done with the valve, I had to cut off the small bit of connected airline because it was too stretched out to use (like throwing a hot dog down a hallway).

I didn't really know much about check valves when I ordered these, but it's been some time and I've tried different brands. These are my least favorite and I wouldn't order them again.

Como Fish Tank Clear Plastic Air Pump Outlet Check Valves 5 Pcs

Those look similar to the ones I like but a different brand and color.

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For the price, these are great. They work well. The only negative would be the extra plastic from the molds they came out of. However, I easily trimmed them with a razor blade so it wasn't an issue.

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I ordered a bunch of these to keep on hand. Well, it appears that I only got 2 useful valves out of the entire bunch. When connected to the air pump, these valves whistle, loudly. Too bad as they are perfectly sized as opposed to some of the other check valves that are available.

I'm not sure if was just bad luck but I will not chance reordering these.

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The old saying, an ounce of prevention, is worth a pound of cure, is really true. This product gives you that ounce of prevention for nickles, nuff said....