Poseidon Jetstream O-ring sizes?

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oh I'll post them all, but there are like 6 different first stages, so may as well go with what you need. That said, the biggest point is you do still need to get all the other stuff and if you don't have dealer access to it, having the rings without the rest doesn't really make sense.

The nice thing is if you source the o-rings yourself, Poseidon actually does allow you to buy seats, diaphragms, etc individually so it is much cheaper to do buy a bag of seats, diaphragms, etc. then source your own o-rings if you have a lot of regs. The only exception to that is if you wanted to convert some of the old ones to O2 clean which weren't available with a nitrox kit. That was the driving factor for me to do this far more than the cost of the service kits
 
https://www.shearwater.com/products/peregrine/

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