--- product_id: 237798699 title: "FZONE Aquarium CO2 Regulator for W21.8 Side Open CO2 Cylinder" brand: "fzone" price: "€ 131.86" currency: EUR in_stock: true reviews_count: 13 url: https://www.desertcart.hr/products/237798699-fzone-aquarium-co2-regulator-for-w21-8-side-open-co2 store_origin: HR region: Croatia --- # Dual 1.6-inch gauges 1 bubble/3 sec precision All tools included FZONE Aquarium CO2 Regulator for W21.8 Side Open CO2 Cylinder **Brand:** fzone **Price:** € 131.86 **Availability:** ✅ In Stock ## Summary > 🌿 Elevate your aquarium game with precision CO2 control — because your plants deserve the best! ## Quick Answers - **What is this?** FZONE Aquarium CO2 Regulator for W21.8 Side Open CO2 Cylinder by fzone - **How much does it cost?** € 131.86 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.hr](https://www.desertcart.hr/products/237798699-fzone-aquarium-co2-regulator-for-w21-8-side-open-co2) ## Best For - fzone enthusiasts ## Why This Product - Trusted fzone brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - • **Next-Gen Safety:** Upgraded 12V DC solenoid ensures safer, more stable operation than traditional AC models. - • **Plug & Play Setup:** Includes bubble counter with check valve and all installation tools for effortless DIY assembly. - • **Dual Gauge Clarity:** Large 1.6-inch dual gauges give you instant, crystal-clear readings of cylinder pressure and working pressure. - • **Precision Perfected:** Fine-tune CO2 flow to a flawless 1 bubble every 3 seconds for optimal plant growth. - • **Leak-Proof Confidence:** Enhanced sealing materials prevent leaks, keeping your aquarium environment pristine and worry-free. ## Overview The FZONE Aquarium CO2 Regulator features dual 1.6-inch gauges for easy pressure monitoring, a high-precision fine-tuning mechanism delivering 1 bubble every 3 seconds, and an upgraded 12V DC solenoid for enhanced safety and stability. Made from durable aluminum alloy with leak-proof sealing, it includes a bubble counter with check valve and all necessary installation tools, making it the ideal DIY CO2 system for thriving aquatic plants. ## Features - Dual Big Gauge. 1.6 inch big dual gauge easy to read your cylinder inner and working Pressure - Updated Split-Type DC Solenoid. Newest 12 DC split-type solenoid instead AC models, more safe and stable. - High Precision Structure. This regulator is designed for the aquarium. High precision fine-tuning easy for co2 to be 1 bubble in 3 seconds. Upgraded sealing material avoid any leak - Bubble Counter and Tools Included. Together with bubble counter, you can read your co2 flow rate. Bubble counter with check valve function, stop water backflow to bottle. All installing tools included, make all goes easy - Class 1 Manufacturing Technology. Made of hard aluminum alloy, surface spraying treated. Pressure knob and fine tuning knob with knurled ## Technical Specifications | Specification | Value | |---------------|-------| | Asin | B07QFT69P8 | | Best Sellers Rank | 34,181 in Sports & Outdoors (See Top 100 in Sports & Outdoors) 10 in CO2 Systems | | Brand Name | FZONE | | Country Of Origin | China | | Customer Reviews | 4.1 4.1 out of 5 stars (1,284) 4.1 out of 5 stars | | Included Components | 1 x Double Mini Display Valve Body, 1 x 110V US Standard Solenoid Valve on the Valve Body, 1 x Fine Tuning Valve on Valve Body, 1 x Bubble Counter with Check Valve Function, 1 x Installation Tool | | Item Form | Gas | | Item Weight | 0.9 Grams | | Manufacturer | FZONE | | Manufacturer Part Number | FZ-0100 | | Model Number | 748323719468 | | Number Of Items | 1 | | Number Of Packs | 1 | | Pet Type | Fish | | Target Species | Fish | | Unit Count | 1.00 count | | Upc | 748323719468 | ## Product Details - **Brand:** FZONE - **Item form:** Gas - **Item weight:** 0.9 Grams - **Number of Packs:** 1 - **Unit count:** 1.00 count ## Images ![FZONE Aquarium CO2 Regulator for W21.8 Side Open CO2 Cylinder - Image 1](https://m.media-amazon.com/images/I/61cgmb2Lt6L.jpg) ## Questions & Answers **Q: How do you fit this to a fire extinguisher** A: remove extinguisher horn with a spanner. fit regulator to coupling you have just removed the horn from, make sure to use supplied washer, tighten with spanner. **Q: what connection is this cga320 or w21.8 and is it a uk plug as the listing and photos are conflicting with the advert?** A: Sorry, it should be W21.8 cylinder.We will update the information ASAP. And the W21.8 cylinder is suitable for EU plug. **Q: Hi, i’ve just received this item. it works exactly the same if the solonoid is plugged in or not. is it defective or am i missing something? cheers** A: Mine is exactly the same. Can the seller please supply valve strip and clean instructions? **Q: Where do I buy compatible manifold blocks if i want to increase the number of outlets from a single tank of CO2?** A: Amazon seems a good stockist ## Customer Reviews ### ⭐⭐⭐⭐⭐ Premium performance without the markup! *by on Reviewed in the United Kingdom 24 December 2025* I recently upgraded to this FZONE regulator, and I’m genuinely impressed!If you are looking for a high-quality CO2 setup but don't want to pay double for a "luxury" brand name, this is the one to get.Build Quality:Right out of the box, it feels incredibly solid. It has a heavy, professional-grade aluminum body and the gauges are clear and easy to read. It doesn’t feel like a "budget" tool at all.Accuracy & Performance:The needle valve is surprisingly precise. I was able to dial it down to exactly 1 bubble every 3 seconds with zero "drift" over time. The 12V DC solenoid is silent and stays cool to the touch, which is a huge plus.Ease of Use:It comes with everything you need—tools, extra O-rings, and a clear manual. Setup took me less than 10 minutes.Customer Support:I had a small question about the solenoid during installation, and the FZONE team got back to me almost immediately. Their support is top-tier and they clearly stand by their product.Bottom Line:Amazing value. It’s rare to find this level of accuracy and build quality at this price point.Highly recommended! ### ⭐⭐⭐⭐⭐ perfect for the price! *by on Reviewed in the United Kingdom 10 May 2026* I’ve been with FZone for about a year now, and my experience has been absolutely excellent from start to finish. Their customer service has always been professional, fast, and extremely helpful.Recently, I had a small issue, and they handled everything under warranty without any hassle at all, which really shows how much they care about their customers.The quality of their work and support is top-tier. You can truly see the dedication and excellence in everything they do. I highly recommend FZone to anyone looking for reliability, quality, and outstanding after-sales support.A huge thank you to the whole team for the exceptional experience! ### ⭐⭐⭐⭐ Does the job! *by on Reviewed in the United Kingdom 4 October 2023* It does the job as intended and easy to put together. I used a C02 Fire Extinguisher rather than a canister.The product does get quite hot however.My plants didn’t grow any extra or better though after 2 months of using this. Not a reflection on the product as this did the job intended. Just advising that C02 injection doesn’t always make plants grow better. ## Frequently Bought Together - FZONE Aquarium Co2 Regulator DC Solenoid with Bubble Counter and Check Valve Plant Grow DIY CO2 System CGA320 Side Open Cylinder - FZONE Aquatic CO2 Glass Drop Checker PH Momitor for Aquarium Plant Fish Tank Test CO2 Kit - Fzone Neo CO2 Diffuser with Customized Ceramic from South Korea(L-24mm) --- ## Why Shop on Desertcart? - 🛒 **Trusted by 1.3+ Million Shoppers** — Serving international shoppers since 2016 - 🌍 **Shop Globally** — Access 737+ million products across 21 categories - 💰 **No Hidden Fees** — All customs, duties, and taxes included in the price - 🔄 **15-Day Free Returns** — Hassle-free returns (30 days for PRO members) - 🔒 **Secure Payments** — Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** — Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.hr/products/237798699-fzone-aquarium-co2-regulator-for-w21-8-side-open-co2](https://www.desertcart.hr/products/237798699-fzone-aquarium-co2-regulator-for-w21-8-side-open-co2) --- *Product available on Desertcart Croatia* *Store origin: HR* *Last updated: 2026-10-05*