General description The package contains 90 black aquarium air pump control valves, which are sufficient to meet your daily needs and replacements. These valves feature a two-way control mechanism, allowing for easy installation by simply plugging them directly into a 4mm hose. Technical specifications Material: High-quality plastic Color: Black Length: 38 mm / 1.5 inches Connector diameter: 4 mm / 0.16 inches Measurement allowed error: +/- 1-3 cm Usage The aquarium air pump valve can be used in various settings, including home aquariums, landscape aquariums, restaurant ornamental aquariums, or other drip irrigation systems. It can be rotated to control the flow of air or water, making switching simple and convenient. Other information Note: Light reflection and different displays may cause the color of the item to differ slightly from the actual product.