Having a little fun : what is this ?

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Reign1

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Posting a picture totally time stamping my saltwater journey ..
who will be the first to correctly identify this ?
*Also anyone have any other photos to post please do let’s make this fun****

BD7F23EE-F81B-421B-81A5-CB991F75A08F.jpeg
 
Is it some sort of denitrator?
 
regulator check valve
 

WHAT DO YOU ALWAYS RUN OUT OF AT THE WORST TIME?

  • Salt mix

    Votes: 10 17.2%
  • Fish or coral food

    Votes: 4 6.9%
  • Test kits or reagents

    Votes: 4 6.9%
  • Filter media or replacement fleece

    Votes: 4 6.9%
  • RO/DI filters or supplies

    Votes: 9 15.5%
  • Fragging and repair supplies, like glue or epoxy

    Votes: 6 10.3%
  • I keep a backup of everything

    Votes: 16 27.6%
  • Other (Post in the comments)

    Votes: 5 8.6%
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