General description Efficient and effective protection for your aquarium pump, this one-way check valve is designed to prevent backflow and protect your electrical equipment, such as air pumps. Each valve is made from high-quality plastic and is ideal for use in fish tanks. Technical specifications Length: approximately 3.5 cm (1.38 inches) Tube Calibre: 0.5 cm Power: 1W Color: blue Material: plastic Package Contents: 100 aquarium check valves Other information Note: Light reflection and different displays may cause the color of the item in the picture to differ slightly from the actual product. The measurement allowed error is +/- 1-3 cm.