Brand and high quality Easy for installation Excellent CO2 dissolve rate Provide elegant look for your fish tank Suitable pipes with an inner diameter of 4mm Type: Carbon Dioxide Refiner Length: 60mm Refine Diameter: 24mm Notes: The self-made CO2 pressure can reach 1.2 kg to release gas, and the normal self-made pressure is around 1.5. If you 't know homemade pressure, ask the seller who bought homemade CO2 products Since the effect of thinning tablets is better after soaking, please be to soak for 48 hours before using Colour:Blue Material:aluminum alloy Package Contents: 1 x Aquarium Atomizer Diffuser 1 x Sucker Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.