Nano ceramic chips have a better effect of refining the air in the water.Material: GlassesSize: Large, Small (Optional)Package list: 1 x Regulating Valve1 x U Shaped Connecting Pipe1 x Check Valve1 x Oxidation tubeUsing instructions:1. Diffuser must be match with Oxygen PumpGas Disk should be soak in water for 2 hours before using2. Remove from the tanks and rinse repeatedly if there is fouling and bubbles are reduced during long-term using

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