•  Consists of a positive pressure valve, negative pressure valve, spring, and O-ring.

•  When there is positive pressure in the fuel tank due to evaporative gas, the evaporative gas is released into the atmosphere. When there is negative pressure, air is introduced to the fuel tank.

•  The positive pressure valve and negative pressure valve opening pressures are higher than the check valve (two-way), therefore the positive and negative pressure valves are normally not open.

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