The valve is intended for maintenance of pressure in a tank due to removal of vapors at increase in their pressure above norm. Couples are taken away in a tank with an absorber. The valve is mounted on a hose, between the union on a tank and the ball backpressure valve.

1. Squeeze collars and remove hoses from the valve.

2. Dress hoses on the new valve, it is correct it having oriented.

3. The valve is checked by a purge in both directions. Air has to pass only from the fuel tank.