Features: Prevents water backflow with its unique unidirectional design, safeguarding aquarium air pumps while enhancing oxygen dissolution efficiency in fish tanks. Effortlessly integrates with existing CO2 setups via its design, combining industrial durability with user friendly operations for easy installation. Ideal for aquarium enthusiasts, fish breeders, and pet store owners want reliable accessories to improve ecosystems. Perfect for home aquariums or commercial setups to maintain oxygen rich water and protect equipment from reverse flowing damage. Engineered with precise airflows control, these check valves blend discreetly into tanks setups while ensuring uninterrupted aeration. Specifications: Component: Aluminum Alloy+Acrylic Size: approx. 9.6cm/3.78inch Quantity: 1pc Package Includes: 1pc Solenoid valves bubble meter note: Please allow 1-2cm errors due to manual measurement. Due to the differences between different monitors, the picture may not reflect the actual color.