Suction cup can be securely attached to the fish tank. Improves water clarity in the aquarium. Lightweight and high-quality construction. High-density ceramic disc for effective CO2 diffusion. Sturdy design. Powerful suction cup for secure attachment to glass aquariums. Surface treatment: nickel-plated, refined diffuser cup, non-slip knurled texture. Adjustable length to suit various aquarium heights. Initial bubble accumulation on the ceramic disc is normal and typically resolves within 24 hours. If bubbles persist or the disc becomes covered with algae over time, clean by soaking or replace as needed. Color: Silver Material: Aluminum alloy Overall size: 62 mm Suction cup diameter: 24 mm PU tubing diameter: 4 mm PU tubing length: 200 cm Diffuser cup diameter: 24 mm Package includes: 4 × CO2 diffusers 4 × suction cups Note: Color may vary slightly due to monitor settings and lighting conditions. Measurement tolerance: ±1–3 cm.