CO2 Diffuser Stuck
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Old 01-19-2015, 05:16 PM   #1
Naiad
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CO2 Diffuser Stuck


I have a fluval 88g CO2 diffuser that is in need of replacement ceramic disks. I bought the disks...but I can't unscrew it! Any suggestions as to how I can get this thing open? I've already gone at it with pliers, too.
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Old 01-19-2015, 09:04 PM   #2
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If tapping on it lightly with a metal object does not free it up, try holding it under hot water to heat it up and then throw it in a bowl with ice water. the expansion/contraction of the material should free it up
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Old 01-19-2015, 11:24 PM   #3
PlantedRich
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Sudden expansion/contraction on hard objects can get a bit risky as it may break. I would favor doing a soak to try to remove any mineral deposits involved. Vinegar dissolves hard water deposits like calcium from hard water.
Maybe the heating cooling is needed but I like to go gentle at first.
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Old 01-20-2015, 12:08 AM   #4
Solcielo lawrencia
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Why does the disk need replacement? Have you tried cleaning it with a mild bleach solution?
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Old 01-20-2015, 12:16 AM   #5
charlie 1
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I have experienced the same thing, I pried it apart gently with a small screwdriver.
You have to do it slowly , working around the disc, it is threaded but it eventually loosens up.
Do this at your own risk
Good Luck
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Old 01-20-2015, 03:15 AM   #6
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Thanks for all your replies. I tried everything, but the heating/cooling and was about to try that when a very strong friend said "challenge accepted" and unscrewed it for me! (I probably loosened it up haha...) He did require grip gloves and pliers, though. Anyway, problem solved and it's since been replaced.


Also, I replaced the disk instead of cleaning it because it's a couple years old and the rubber seal has hardened. Plus, it's discolored so it would never look bright white again.


Thanks, everyone!
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Old 01-20-2015, 06:00 PM   #7
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Yeah the heating/cooling can seem a bit scary, but as long as you are not super heating and then super cooling it should be fine. I run my stuff under tap at its hottest, maybe 120*? until the heat saturates the entire piece and then into the iced water. I can see where if you pulled it out of boiling water and into ice water it may crack depending on the brittleness of the plastic. I would avoid this all together if you are working with glass.
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Old 01-20-2015, 07:58 PM   #8
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Having friends with muscle is often a really good answer.
I once saw three guys who could not get a hog to walk up a ramp to the truck. After lots of yelling and thinking, one big guy grabbed an ear and a tail and threw the hog in the truck!
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