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Turns out instruction text was correct and Figure 1 is wrong. Here are the instructions: "Take the pressure reducer (N) and make sure that the regulation knob is closed (turn clockwise) -Fig. 1-", I thought when turning the valve counter clockwise as indicated in Fig 1 a spring controlled pin would be released such that CO2 would be blocked from escaping into the central well. Unfortunately it didn't and this time the CO2 escaped from a different pressure relief hole. You might say that clockwise is "righty tighty" is obviously closed but Fig 1, and the fact that a small plus sign to the left of the word Hydor and a minus to the left led to imagine minus meant closed and Fig 1 was correct and counterclockwise was the way to go. A further indication these instructions are screwed up is that next statement referencing the valve reads "Slowly turn clockwise the regulation knob on the pressure reducer checking that the CO2 reaches the bubbles counter, then proceed with the first regulation setting the desired amount of bubbles". Following the text instructions the valve is already in the completely clockwise position! Geese. Open/closed, plus/minus, clockwise/counterclockwise! I have a nice CO2 burn on my hand now.

Could I get an exploded diagram of this valve please?

Where can I get a replacement "o-ring" for this unit?

Pictures available here: http://fwaquarium.blogspot.com/

Well, I got the pressure relieved and unscrewed the valve so I see what was going on. It looks like there were two "o-rings" in the valve, two clear disks with a hole in the center. One of them looks shredded. Was the unit supposed to ship with both rings inserted? I screwed the cartridge on with hand strength only and I'm not a strong guy. Any thoughts out there?

As I unscrewed the valve somewhat some plastic was extruded from what I assume is a pressure relief hole. Now CO2 will flow from this hole when the valve is somewhat unscrewed from the cartridge.

My system is new. I have attached the pressure reducer to a new 74 gr cartridge firmly by hand. When I open the pressure reducer no gas escapes. When I turn the pressure reducer from open to closed I can hear brief puffs of escaping gas but then it stops immediately. No consistent gas is released. When I screwed the cartridge gas on the first time some gas escaped around the threads so I know the cartridge is pressurized. When I unscrew the cartridge slightly some gas escapes around the threads so I know it is still pressurized. Any advice?

Dear Customer, thank you for your contact. It is very strange that Ario Color 4 stops working completely. In this case, you can clean it and control if every single part of the unit is undamaged. In particular, we suggest you check if the Ario is correctly connected to the electric supply, or if the air pump is damaged or positioned at the correct depth. You can also check if the air control is blocked or partially closed, and if the unit is correctly positioned (some gravel can accidentally block the pre-filter). Hope this helps!

Hi there I am having a problem with a blue Hydor Color 4 unit - this is the second unit I have got and had fail on me within a year. It stops working completely - no aeration or light. Is this normal? I don't want to go spending money on another unit just to have it fail on me again. Can you advise if there is anything that can be done regarding this.

Dear Customer, thank you for contacting our Forum. All you have done to solve the problem you are having is correct and it appears very strange that the flow hasn't increased back to standard. May we suggest you check thoroughly also the black, u-shaped, hard plastic tubes. Sometimes dirt gets stuck in the elbows/curves, so you might want to clean them with a thin brush. Also, please check that the rotor/impeller is not missing any part or broken and is correctly positioned. Hope this helps!