OP
All but 2 were fresh water. I rinsed them and dove within 4 days in freshwater for a dive. DIN on HP steel tanks.
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Surprisingly time got away from me being under stay at home. I looked at the plunger and the only imperfection I can see is the side near the metal which looks like where it would have connected from the injection molding with a bunch of them connected together if that is how they make them. Would a small imperfection on the side affect it or just the front surface? The small o-rings have a little piece sticking out as you can see from the picture. I reached out to them to see if there was something I could do to make it last longer between services but understandably with everything going on no response. If anything this showed me why it is important to take the regulator repair class so I can better understand my equipment. Thanks for all your comments.Can you take a better picture of the HP seat for us?