Suit for use with air pumps and oxygen systems, this control valve is suitable for various aquarium sizes and setups. It helps regulate airflow, making your aquatic pets receive the oxygen they need. Whether for home aquariums or fish tanks, this valve enhances the overall functionality of your system. Features -Color:Transparent -Material:Plastic -Size:4.00X2.30X2.30cm/1.57X0.90X0.90in -Backflow prevention: stops water from reversing into the oxygen pump, protecting it from potential damage and making Sturdy use -Safe stability: prevents water from backflowing into the aquarium, maintaining balance and enhancing the viewing use -Userfriendly installation: designed for easy installation with various oxygen pumps, providing water flow control -Silent functionality: precision engineering makes quiet use, creating a serene and comfortable environment for your aquarium -Construction: made from Sturdy plastic, it withstands longterm, resists aging, and extends the product's lifespan Package list: 50 x aquarium check valve