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"I did more research, and realized I almost would rather be a biologist than a writer, because there was incredible stuff going on!"
- Greg Bear

Filt-Plug  
  A nose plug worn to collect moisture from exhaled air.  

On parched Arrakis, the wise traveler wears filt-plugs and a breathing mask over the mouth, to conserve moisture.

FILT-PLUG: a nose filter unit worn with a stillsuit to capture moisture from the exhaled breath.
From Dune, by Frank Herbert.
Published by Putnam in 1965
Additional resources -

Here are a couple of additional quotes:

"In the open desert, you wear this filter across your face, this tube in the nostrils with these plugs to insure a tight fit. Breathe in through the mouth filter, out through the nose tube. With a Fremen suit in good working order, you won't lose more than a thimbleful of moisture a day - even if you're caught in the Great Erg..."

Paul's stillsuit rode easily on his body and he was only distantly aware of his nose plugs, the breathing mask..."

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Additional resources:
  More Ideas and Technology from Dune
  More Ideas and Technology by Frank Herbert
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