Product Description: Item Type:CO2 Diffuser Material:Glass Feature:Non-toxic Size:6 cm/2.36"*2 cm/0.79" Color:White Features: 1. Check Tap: it has the function that prevents the water from pouring into the oxygen pump to protect oxygen pump. 2. CO2 glass refiner: the body adopts high-quality glass, which is resistant to acid and alkali and free from corrosion, and it has high transparency. 3. With a curved glass connecting pipe, the exterior is small and beautiful, especially for the water grass fish tank, which does not occupy space. 4. Can significantly increase the dissolution rate of CO2 and high diffusion efficiency. 5. Note: glass products are beautiful but fragile, please use carefully, do not use brute force to insert the tube, so as not to break the glass tube, it is suggested that the pipe head is scalded to soft by boiling water before inserting the tube. Package Include: 1 x CO2 Glass Refiner 1 x Check Tap 1 x U-shape Tube 1 x Sucker Notes: 1. Please allow 1-3 cm difference due to manual measurement and 3-5 g for the difference between different colors.