The Marina Check Valve prevents water from siphoning out of the aquarium through the air hose and into the air pump in the event of a power failure or when removing filters and other air-driven accessories from the aquarium.
![Two-Way Plastic Valve 2pk Two-Way Plastic Valve 2pk](https://cdn11.bigcommerce.com/s-ldfio/images/stencil/500x659/products/1138/181301/original__01676.1720629833.jpg?c=2)
The Marina Check Valve prevents water from siphoning out of the aquarium through the air hose and into the air pump in the event of a power failure or when removing filters and other air-driven accessories from the aquarium.