Headlamp-Leveling Vacuum Coupling

Replacement pneumatic coupling for the vacuum-operated headlamp height adjustment, developed for a C180 after the original connector broke and leaked. The creator sealed the printed part with nail polish to make it airtight. Match both hose and headlamp ports, use fuel/oil/heat-resistant material suitable for engine-bay vacuum service, seal without obstructing the passages, leak-test the system and verify both lamps adjust and remain correctly aimed before night driving. The moulded fragment “012502” is preserved as evidence but is not treated as a complete Mercedes part number.