Welcome to Rebreather World.
Have a look in the articles section, you'll find plenty of info, teardowns and buildups of different RBs.
A PRISM works for me. 
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Cheers
Stefan
"Political Correctness is a doctrine, fostered by a delusional, illogical minority,
and rabidly promoted by an unscrupulous mainstream media,
which holds forth the proposition that it is entirely possible to pick up a turd by the clean end.!"
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