1, easy to open and near quickly, hard work saving, fluid resistance is small, can frequently perform.  2, easy structure, small size, light weight.  Three, can shipping dust, on the mouth of the least liquid accumulation.  Four. suitable sealing can be achieved below low pressure.  5, desirable

1, easy to open and near quickly, hard work saving, fluid resistance is small, can frequently perform.  2, easy structure, small size, light weight.  Three, can shipping dust, on the mouth of the least liquid accumulation.  Four. suitable sealing can be achieved below low pressure.  5, desirable

1, easy to open and near quickly, hard work saving, fluid resistance is small, can frequently perform.  2, easy structure, small size, light weight.  Three, can shipping dust, on the mouth of the least liquid accumulation.  Four. suitable sealing can be achieved below low pressure.  5, desirable

1, easy to open and near quickly, hard work saving, fluid resistance is small, can frequently perform.  2, easy structure, small size, light weight.  Three, can shipping dust, on the mouth of the least liquid accumulation.  Four. suitable sealing can be achieved below low pressure.  5, desirable