Topran Coolant flange (top radiator) Jetta (1.4TSI)

Radiator Coolant Hose Adapter
A radiator coolant hose adapter is a connector used to join different sections of coolant hoses or to transition between varying hose sizes in a vehicle?s cooling system. It ensures a secure, leak-free connection and helps maintain proper coolant flow between the radiator, engine, and other cooling components. Made from durable materials such as aluminum, plastic, or brass, the adapter withstands heat, pressure, and chemical exposure for reliable long-term use.

Radiator Coolant Hose Adapter Failure Symptoms
Coolant leaks around the adapter or hose connections.
Engine overheating, due to restricted or lost coolant flow.
Cracks, corrosion, or warping of the adapter, weakening its sealing ability.