•  The check valve (two-way) maintain the pressure in the fuel tank at constant pressure.

•  Press-fitted in the check valve (two-way) in the rollover valve and cannot be removed/installed.

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•  Mainly consists of positive and negative pressure valves.

•  The valve moves in response to the difference in air pressure between the fuel tank side and the atmospheric side, thereby changing the path of airflow.

•  When the pressure in the fuel tank becomes negative due to fuel consumption or other factors, the path opens, drawing atmospheric air into the fuel tank.