Application: Suitable for all kinds of DIY, safe, durable and waterproof reactors. Size: Diameter: 3.5cm / 1.4 inch, height: 3.5cm / 1.4 inch. Easy installation: It can be directly screwed on the gaseous beverage bottle and connected to the trachea for use. The specification of the trachea that can be connected to the seal is 4 mm in diameter inside and 6 mm in diameter. Diameter Exterior. Add and control the amount of CO2 available for your fish and plants, add CO2 essential to the water of your aquarium. Material: ABS Color: Gray Size: Diameter: 3.5 cm Height: 3.5 cm Package Included: 4 * Bottle cap DIY Reactors CO2
