Some have a flashing of plastic on the non-o-ring side of the union left over from the molding process... I use some 600 grit then 1500 grit sand paper to smooth it down. Saves the o-ring from distress.
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Single System Setup: 210G SPS reef, 225G FOWLR, 72G water change, 50G frag, 120G sump. I promise a journal at some point! (anyone need some coral frags? I likely always have stuff that is frag-ready)
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