Product features: It is suitable for carbon dioxide supply systems such as fish tanks and aquariums and air pump systems. Effectively prevents water from entering the air pump and in the carbon dioxide cylinder in the event of a power outage. It is made of stainless steel and has corrosion resistance and longevity. Easy operation, easy to clean and repair. Specification: Condition: 100% Brand New Item Material: Stainless Steel Hole Diameter: 1.5mm< br/> Connector Hole Diameter: 4mm Color: Silver Weight: about 25g Quantity: 2 Package Content: 2 * Non-return valve
