I was actually pleasantly surprised at how well these check valves perform! I was expecting them to be cheap and light but instead they are heavy and well made. I found the internal structure of the o-ring to be better than what I bought from BR and MD. You will not be disappointed with the quality of these valves. I run them at 70psi and they are fine. I suspect they will easily hit 90+ psi due to thicker plastic and good o-rings.
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