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This one way non return valve is widely used for aquarium and fish tank, pipeline, which prevent water, fuel, gas, liquid, air, from flowing backwards. The ports are tightly connected, good sealing, no leakage; one way non return valve, air pump protection in power outage. Under 25 ~ 60 environment is normal performance, heat resistant and has good formability, lightweight, easy to install. High adsorption properties, thermal stability, chemical stability, has high mechanical strength, etc Medical grade material, safe and nontoxic, strong resistance to acid, alkali, salt corrosion ability, wear-resistant.