i would replace it. you dont want it to fail and get stuck in the open position dumping excess Co2 .
with some things its better to be safe than sorry
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~Mario
Current Tank Info: 4x2x2 120 gallon SPS/LPS reef ,40 gallon sump/fuge, H&S skimmer A150-F2001, 2x250 MH, 4x65 CF, Knopp HD calcium reactor,2x Vortech MP40W, 2x Koralia #3, AC JR / 30x20x12 frag tank
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