20pcs Aquarium Fish Tank Air Pump Accessories Unidirectional Water Check Valve T

Feature: \n 1. With high quality materials production, good durability.\n2. When the air pump is placed below the water surface, prevent backflow of water to damage the front air pump or other product equipment. After adding the stop valve, the air pump can be placed above the water surface or below the water surface, and there will be no backflow of water when the air pump is turned off.\n3. Using an air pump is very easy to solve and use to prevent water from entering the machine pump.\n4. Prevent the water in the fish tank from flowing back into the air pump and burn the air pump to avoid danger.\n5. Suitable for fish tank, aquarium air pump. \n\nSpecification: \nCondition: 100% brand newItem type: Water Check ValveMaterial: PVCColor: transparent colorLength: Approx. 5.5cm/2.2in\n\nSuitable for air inlet/outlet pressure gauge tube: Approx. 4mm/0.16inWeight: Approx. 59g \nFunction: Used as oxygenation pump due to the pressure difference between the inside and outside when: