So I bought this product for a home project. I didn't want water getting back into my air pump so I installed it. It worked out of the box. BUT. It doesn't stay connected to the air line (maybe my air pump is too strong?). I have to repaste the line, just awkward to paste the line once a week. If they had done it with barbs, this would not have happened. PS I use RUBBER lines, not silicone. UPDATE: none of them work anymore, I checked my check valves by turning off the air compressor and the water is back! All 6 failed in 1 month. I really don't know how they got such rave reviews.
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