20Pcs Fish Tanks Air Pump Unidirectional Check Valve Supplies Aquarium Accessori

Feature: \n 1. Made of high-quality plastic materials, with good durability and stability.\n2. It can prevent the water in the fish tanks from flowing back into the air pump and is an indispensable accessory of the air pump.\n3. The installation method is simple, safe and reliable, suitable for use in aquarium fish tanks.\n4. When the air pump is placed below water surface, can prevent water from flowing back and damage front air pump or other product equipment.\n5. After adding the valve, the air pump can be placed above the water surface or below, there will never be a danger of water backflow when the air pump is powered off and stops working. \n\nSpecification: \nCondition: 100% Brand New\nItem Type: Check Valve\nMaterial: Plastic\nProduct Color: Blue\nSuitable for: Inlet/outlet pressure gauge tube 4mm / 0.2in\nFunction: Used as an oxygenation pump due to the pressure difference between the inside and outside when the work stops suddenly, causing the water flowing to reverse, dam: