Escape 4WD V6-181 3.0L DOHC VIN 1 Duratec (2003)
![background image](/ford/escape_4wd/v6-181_3.0l_dohc_vin_1_duratec/Page-1282004.png)
Vacuum Check Valve
A vacuum check valve blocks air flow in one direction. It allows free air flow in the other direction. The check side of this valve will hold the
highest vacuum registered on the vacuum side.