... to prolong the using life, adopting the starting liquid to resisting rust,deteroprate, freeze,boiling(boiling point ... order to prevent the harm of inter parts or liquid leakage. it can not knock heavily, after ... its desing is maintenance free. 2,When the liquid is below than the requetment, it should to ... is to gurantee the motor will not spray liquid during starting. it will open when the speed ...