1. The aquarium check valve prevents water from flowing back into the air pump, which can cause damage and potentially even result in the loss of oxygen in the tank. 2. The aquarium check valve is easy to install and use, simply attach it in line with your air pump and tubing, and the one-way check valve will automatically prevent back siphoning in the event of a power outage. 3. The aquarium check valve detachable design also makes it convenient for routine maintenance, maximizing the longevity and performance of your aquarium equipment.