Environmental seal worth it for saltwater use? General service questions.

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Just out of curiosity, how do i differentiate the environmental sealed and non envirenmental sealed first stage??

I just ordered a set of B2 from LDS.
 
Some are easy to tell. Compare the sealed and non sealed. Others not so much. In that case you ask the dealer or Google the reg.
Thanks for trying to help. I finally found the answer. It was the retainer rubber ring.

With holes, it isn't sealed.
Without holes, and hydrostatic pressure chamber filled with christo lube(spelling) ot's sealed.
 
https://www.shearwater.com/products/peregrine/

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