Regulator Geeks 4: The Atomic TFX

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Loved the series. I have been using the 350/400 since the 90s with thousands of dives on them. All of my student rigs are Mk20or25/D400s.
I just added this very nice original Pilot to my collection today.
Gotta tune it and would love to talk to Rob about that. I probably have parts in a bin somewhere.
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Scored a Dragar Nemo. Is there a number for the seating O ring?
 
What a great collection! Which Dräger Shark o-ring do you need? The one that acts as a seat against the steel cone in the 1st version of the 2nd stage? If you can get it out, you could measure it. Or the one on the bottom of the poppet? The original poppet had a very exotic spring loaded teflon sealing ring (I assume you saw our thread). Some people have replaced it with an o-ring, but there are no specs, that is experimentation, I am afraid..
 
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