Aquarium CO2 diffuser
100% new quality feature: 1. Easy to install. 2. Excellent carbon dioxide dissolution rate. 3. Provide an elegant appearance for your fish tank. Type: CO2 Refining Machine Material: Aluminum alloy Size: 7*4.5cm Entrance diameter: 5mm Suitable for CO2 tubes with an inner diameter of 4mm Package includes: as shown note Due to manual measurement, the product size has an error of 1-2mm, I hope you can understand.