From the liture that was in the post it said...as far as I read it it is good for up to 35 Bar. So it can take the 522psi with out blowing up. The average person has a hard time blowing over 10psi, it just might be stuck and may need a little encourgment to move and once moving it will work fine. I have had this with a few check valves
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1-135 gal Freshwater planted tank
1-120 gal Reef **For Sale**
It's just my opinon, I have lots of them.
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