I checked the tightness of all 3 check valves and found that they leak through the gasket too much until the air doesn't even reach the bottom of the tank (24 inches deep). However, the reflux was ok because the broken seal is behind the valve. Luckily I had some acrylic glue with me and was able to seal it myself and I think acrylic nail polish would probably work too. However, the fact that all 3 of the 3 check valves purchased were purchased all 3 I don't think is a cause for concern. I mean, what are the odds of randomly pulling 3 benchmarks from a batch and finding them all with BIGGER leaks? For me it's not even about customer service or product returns as it seems to me at this point that the seller either has no control over their suppliers or made a conscious choice to sell a faulty product and therefore I would choose that supplier for mine whole life avoid future. Purchases.
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