Features: Height: 16cm / 6.3". Bottle mouth diameter: 7cm / 2.76". Pressure ranges: 0.02MPA-0.04MPA. Produced of quality , , for long service life. Widely application for different purposes. Specifications: Height: 16cm / 6.3" Bottle mouth diameter: 7cm / 2.76" : Plastic Pressure ranges: 0.02MPA-0.04MPA Note: Please allow 1 to 3cm error due to manual measurement, please make sure you do not mind before you bid, Due to the difference between different monitors, the picture may not reflect the actual color of the item. Package includes: 1xOxygen Bubbler Bottle