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.

THIS PRODUCT CANNOT BE SHIPPED OUTSIDE OF THE UNITED STATES. Due to distribution contracts Hagen has with its distributors around the world, we cannot ship their brands (AquaClear, Exo Terra, Fluval, Marina, and Nutrafin) outside of the United States. Our apologies for any inconvenience!