The free shipping method of this product will be letter pack plus. Letter pack delivery is usually required for about 1 to 3 days. If you are in a hurry, please select a courier service. The letter pack has a tracking number and is a face -to -face delivery by sealing. Please note that there will be no damage compensation, no cash on delivery, and no time specification. Diffuser (CO2 forced extension) to forcibly add CO2 essential for aquatic plants.. By attaching the diffuser installed in the aquarium to the hose of the external filter, the inside of the aquarium can be shown neatly.. You can easily change the vertical and horizontal type according to the arrangement of the hose. Bubble counters can always be installed vertically in both directions, both vertical or horizontal.. (The vertical direction for the bubble counter to check the bubbles by adding water is ideal.. ) The fine CO2 added from the high -density ceramic plate has a longer time to stay in the water, so the additive -added efficiency is increased from the CO2 diffusion device installed in the aquarium.. You can check the filter status and dirt condition from the observation window. The built -in ceramic plate can be disassembled, washed, and reused. It also has a backflow prevention valve function. Specification Material: Aluminum Alloy Size: Approximately 10x6x2cm Hose Size: 12/16 Applicable aquarium: freshwater

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