1. The Aquarium L Shape Valve is made from durable and non-toxic materials, its perfect for mending or extending aquariums air hose. Not only are they friendly to people and fish, but they are also designed to provide sufficient oxygen for your pool or fish tank. 2. The Aquarium L Shape Valve design, making it easy to set up and use in any aquatic environment. It provides a secure and reliable connection, ensuring that your oxygenation system operates at its best at all times.