Engine Crankcase Ventilation Hose Tube 270-090-07-00 Wear Resistant Air Intake Pipe for Benz GLA250 CLA250. Crankcase Ventilation, Pressure Relief, Air Intake Circulation. Smooth Ventilation Optimizes Engine Performance ：Inner tube with smooth finish ensures unobstructed crankcase gas circulation, reasonably releases internal pressure, effectively improves idle stability and reduces engine oil seepage risks.
