Product Dimensions:2 x 2 x 2 cm; 100 Grams Size:40cm Quantity:1 batteries required:No Batteries Included:No Item Weight:100 g Welcome to my store , Hope you have a pleasant shopping trip! Features:1.Nano-scale atomization and refinement sheet, fine bubbles, improve refinement and dissolution rate2.Stainless steel material, mirror polished, anti-corrosion and durable, long service life, suitable for both seawater and freshwater fish tanks3.Connecting trachea: 4mmx6mm (inner diameter x outer diameter) / 3/16" inner diameter inner diameter trachea4.Simple to Use, Suitable For Water Plants in Aquariums to Supply CO2, Need to Be Connected to CO2 Cylinders and GeneratorsSpecifications Material: SUS304 stainless steelSize :25cm:suitable for fish tank height 35cm30cm:suitable for fish tank height 40cm35cm:suitable for fish tank height 45cm 40cm: suitable for fish tank height 50cmSize selection: first measure the height of the fish tank, subtract the thickness of the mud from the height of the fish tank, and select a thinner close to the length;Package List:1 X Aquarium Stainless Steel CO2 Diffuser Atomizer1x Check Valve2PCS x Suction CupsNotes: 1. Due to the difference between different monitors, the picture may not reflect the actual color of the item. We guarantee the style is the same as shown in the pictures.2. Please allow 1-2cm slight dimension difference due to different manual measurement. Stainless Steel Material, Mirror Polished, Anti-corrosion and Durable, Long Service Life, Suitable For Both Seawater and Freshwater Fish Tanks Integrated Design of Quick-plug Interface and Check Valve, Equipped With Metal Check Valve For Use, and the Thin Sheet Can Be Detached and Replaced Suitable for pressurized CO2 supplying systems. This diffuser requires at least 2.5Kg/cm ( 40PSI)working pressure for optimal operation. External Hanging Fish Tank CO2 Refiner Length Specification: 25cm/30cm/35cm/40cm, You Need to Choose the Appropriate Refiner According to the Size and Height of the Fish Tank, Suitable For Medium and Large Fish Tanks and Aquatic Plants. SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Feel Free to Contact Us.We Will Provide After-sales Service Until You Are Satisfied. See more product details Stainless Steel Material, Mirror Polished, Anti-corrosion and Durable, Long Service Life, Suitable For Both Seawater and Freshwater Fish Tanks Integrated Design of Quick-plug Interface and Check Valve, Equipped With Metal Check Valve For Use, and the Thin Sheet Can Be Detached and Replaced Suitable for pressurized CO2 supplying systems. This diffuser requires at least 2.5Kg/cm ( 40PSI)working pressure for optimal operation. External Hanging Fish Tank CO2 Refiner Length Specification: 25cm/30cm/35cm/40cm, You Need to Choose the Appropriate Refiner According to the Size and Height of the Fish Tank, Suitable For Medium and Large Fish Tanks and Aquatic Plants. SHOP WITH CONFIDENCE: To Provide You With the Highest Quality Service, If You Have Any Question, Please Feel Free to Contact Us.We Will Provide After-sales Service Until You Are Satisfied.