FZONE Aquarium Co2 Regulator DC Solenoid with Bubble Counter and Check Valve Plant Grow DIY CO2 System CGA320 Side Open Cylinder

The Fzone CO2 Regulator is an excellent choice for aquarists seeking precise CO2 control and reliable performance. While it may not come with a two stage, the regulator's accuracy and durability make it a valuable investment for any aquarium enthusiast. I highly recommend this product to anyone looking to optimize their aquarium's CO2 levels at a affordable price.

I decided to give this regulator a shot after having two Milwaukee regulators fail on my over the last year and a half. At first, I was nervous because this solenoid ran hotter than the other two. Customer service reached out to me and explained what I should expect. I have not had a single issue with this regulator and it works great for the price!

It's just so frustrating...I purchased this regulator & got it installed less than a week ago. I've purchased FZONE equipment in the past for other aquariums, and I was very pleased with the overall quality of this regulator when I unboxed it. Set-up was very straight forward, and everything was operating normally during this first week that I've had it.Yesterday I heard a hissing sound coming from the regulator. I could tell right away that the issue was not coming from the main connection between the regular and the CO2 tank...That was fine.When I took a closer look, I thought the issue was with one of the threaded connections from one of the gauges, into the metal housing of the regulator. However, this was not the case either.It turns out that the leak was actually coming from the Outlet Pressure Gauge itself! The metal seam along the outside of the gauge was leaking CO2.I'm hoping that this is a case of just a little bad luck...my past experience with FZONE products has been positive. I'm within the Amazon return window, so I will look to get a replacement. If the replacement unit is trouble-free, I'll gladly edit this review rating to something more appropriate.Review Updates (4/26/25):The Amazon return & replacement went process quick and pain-free (as it usually is). The new regulator was installed and running within about day.I would like to specifically comment about the FZONE Customer Service Team. They were incredibly attentive to my issues, and were eager to help me resolve any problems I was having with the regulator. I had several communications with them throughout the Amazon product-return process. Because I was well-within the normal Amazon return window, I chose that route to expedite things. However, after speaking with them on this issue, I'm confident that FZONE would be there to assist me if I needed any assistance during the products warranty period. Please be sure to provide them with the requested warranty information after purchase.I felt these comments were important, because as a frequent Amazon shopper, comments regarding customer service often makes a difference in my purchasing habits.

Coming back to write this review after owning it for about 4 years now, and consistently run for about 3 years (roughly about two 1.5 year stretches with a 6 month storage break in a hot garage). This unit is robust and has been pretty solid and it just works.Tonight, the o-ring failed on the unit (hissing at the bottle nozzle and I felt escaping CO2 at the connection between the unit and the CO2 bottle) and I was able to very easily replace the o-ring with the included spares and get the regulator back up and running within minutes. The construction of the unit is not to blame at all, it was just likely time for the o-ring to call it quits.The included extra o-rings are just a smart choice, and the unit overall has been running for about 1.5 years straight on an 8 hour on-16 hour off cycle with it's most recent stint. The solenoid does get very warm but it doesn't seem to have affected the operation over time. Overall I'm very happy with this purchase and the quality of the regulator.

Item came dent, scratches all over the place, solenoid was dent as well, and gauges were scratched and sticky. This product looks like its been used multiple times. I got an Fzone inline diffuser as well but will be returning both as I can not trust the quality of products. The diffuser looked and felt like good quality but if they are willing to send an item that is defective, dent, and used how do I know the diffuser isn't done the same way? Either way I will never use an Fzone product again on any of my tanks and future tanks.