This aquarium accessory meets the needs of users seeking Sturdy and easy fish tank check valve for their fish tanks. By preventing water backflow and making consistent oxygen , it supports a healthy aquatic environment. Its Sturdy construction and easy installation make it a addition to any aquarium setup. Features -Color:Transparent -Material:Plastic -Size:4.00X2.30X2.30cm/1.57X0.90X0.90in -Water backflow prevention: stops water from flowing back into the oxygen pump, protecting it from damage and making longterm stable use -Safe maintenance: prevents water from backflowing into the fish tank, maintaining balance and enhancing the viewing use -Simple installation: suitable for various oxygen pumps, easy to install, providing water flow control for your aquarium -Quiet: precision design reduces energy consumption and operates quietly, creating a peaceful and comfortable viewing environment -Sturdy and : made of plastic, it withstands longterm, resists aging, extends service life, and reduces replacement frequency Package list: 50 x aquarium check valve