I've tried the vast majority of the cheap check valves available as I've had trouble figuring out which ones were any good. To be honest there is poor quality control on all of them and you are more likely to have a few bad valves in every batch. However, this brand seems to have the fewest defective check valves. Just make sure you test each one before using it by blowing on the opposite end of the dart to see if it works.
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