It is used for multiple water circulation of the fish tank and for water replenishment.
On 2015-06-26 18:09:50
I bought underwater / land (out put) of the pump this time. Usability is skillfully used for two mouths on the suction side hose about 1 m, but although it was supposed to be raised even if it did not turn water that is being drawn up, it did not rise inside. Therefore, I think that a check valve is necessary.