The Castle Dawn Aquatics External CO2 Atomiser delivers a powerful and secure method of diffusing CO₂ into your aquarium. Designed for use with high-pressure CO₂ systems, this pro-grade atomiser uses a high-density ceramic tube to create ultra-fine bubbles, ensuring maximum dispersion throughout the water column. Its robust locking bolt mechanism provides a tight, leak-proof seal, even under high pressure, making it a reliable choice for aquascaping setups. Available in two sizes (M1 for 16/22 mm tubing and M2 for 12/16 mm tubing), this external diffuser connects securely to your CO₂ line and remains outside the tank for a cleaner aesthetic. Includes a 1‑Year Warranty as a mark of our confidence in its build quality. Key Features and Important Notes: What’s Included:– 1 × External CO2 Atomiser (Choose M1 or M2 Size)⚠️ CO₂ tubing and regulator not included. Size:M1 – 11.2 × 3.5 × 2.8 cm (H × L × W) – 4.41 × 1.38 × 1.10 inchesM2 – 13.5 × 3.5 × 2.8 cm (H × L × W) – 5.31 × 1.38 × 1.10 inches Hose Compatibility:M1 fits 16/22 mm tubing; M2 fits 12/16 mm tubing. Ultra-Fine Diffusion:High-density ceramic tube creates microbubbles for excellent CO₂ absorption. Secure Bolt Lock:Tight-sealing lock and bolt mechanism prevents gas leaks under pressure. External Setup:Installs outside the tank to keep equipment out of view. Break-In Period:Runs best after 48 hours of use when the membrane reaches peak performance. Warranty:1‑Year Warranty (T&Cs apply) Spare Parts Available:Replacement ceramic tubes sold separately – message us for details. ⚠️ Warning: Beware of cheap CO₂ accessories sold on large e-commerce platforms. Many lack proper pressure handling and may pose serious safety risks. Read more on our blog about the dangers of low-grade manufacturing. ⚠️ Counterfeit Alert: Due to its popularity, fake versions made with unsafe materials are being sold. These imitations may fail under pressure and harm your aquarium setup.