Genuine OEM Volvo Crankcase Ventilation Hose Nipple, part number 30731007. This component serves as the connection point for the crankcase ventilation hose, facilitating the proper flow of gases and maintaining correct crankcase pressure. As a genuine OEM part, it ensures a secure and leak-free connection, vital for the health and efficiency of the engine. Proper crankcase ventilation prevents pressure buildup and oil contamination.