Premium Vector | Positive crankcase ventilation (pcv valve). an ignition engine must have a vent valve for internal and external air pressure to prevent wear due to high pressure.
2178443PE | OEM Paccar® Crankcase Ventilation Module MX-13 — First Truck Parts
Positive Crankcase Ventilation (PCV) and Oil Separators
Working Principle of PCV valve | positive crankcase ventilation | pcv animation - YouTube