Designed for and vehicles including models such as B6, MK5, A3 8P, and A4 B7 Direct replacement for OEM 1K0122157HH used in HVAC heater core coolant circulation systems Constructed from multi-layer EPDM rubber with reinforced synthetic fabric for under temperature coolant conditions Fits standard 16 mm inner diameter and 22 mm outer diameter heater hose connections found on specified vehicle applications Compatible with conventional and long-life antifreeze/coolant formulations commonly used in European and diesel engines, Manufacturer: Hoping