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Check Valve

$ 1.99
$ 1.99
We use these check valves to keep water from siphoning out of the tank when the power is out.  They are made with a rubber flapper instead of a spring like some of the cheaper ones. 

Customer Reviews

Based on 28 reviews
Would buy again.

Feels like quality construction, it doesn't noticably inhibit air flow and they do stop water from siphoning out. I air leak tested 3 of these I am currently using in different conditions for the sake of leaving a review with some data. One had no air leaks, one had a barely detectible air leak, and one had a very noticable air leak. Ultimately the leaks were small and effectively this made no difference in my setups so I won't be looking to replace them and would buy again.

No good for CO2

2 stars because of severe leakage. I bought the diffuser and check valve for co2 setup and zero bubbles made it to diffuser. All leaked out of check valve. However, I am using the check valves on my bubblers but I am concerned that if air gets out, water could too which would defeat the purpose of having a check valve.

Had leak from the get go

Set this up to prevent backflow into my c02 regulator. Did a soap test right after setting up and there was a leak where the black base meets the clear chamber that leaked c02.

Broke within a week

The nipple broke off when I tried to remove tubing.


Just works great, fast shipping, good service.

Shipping Rates
Flat rate shipping on order under $70 of $4.99
FREE Shipping over $70.

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Live Arrival Guarantee
We guarantee our live products will arrive alive. We ask that you do your part and minimize the amount of time our packages sit out in the elements. It can also be a good idea to avoid ordering live items during extreme temperatures. This would be when night time temps are below 35 and over 80 degrees during the day. Now these temps are not for sure death, it's just what makes it easiest for all of us during shipping.

When temperatures are cold we will use heat packs and extreme cold styrofoam liners. Shipping live goods is difficult as our warehouse could be 70 degrees and your home could be snowing, and all the stops in between. We do our best and will make it right for you and may request to try again at a different time.  During heat waves, it's best to avoid ordering live goods as ice packs etc don't do enough to mitigate it. 

30 Day Return Policy
Our goal is to provide a fair way to satisfy our customers and not lose money while doing it. We make every effort to fully disclose how our products work and what is to be expected. A damaged product during shipping is an automatic replacement from us. When it comes to a difference of opinion such as: "My fish doesn’t like this food." That we don’t refund for. However, if you decide the light you bought is a bit too green for your liking, provided it is in the original box, within 30 days and purchased from us, we will refund it at your cost of shipping.

If you would like to return a product, start the process by emailing us at shipping@aquariumcoop.com This allows us to see if there is something we can do before returning the product such as a feature you didn’t know about or send you a return label. We don’t require an RMA number, but do ask you to contact us to initiate the return. Please do not call the retail store as they operate separately from the warehouse and will not be able to issue you a return label etc.

To read our full return policy click here