Rein OE Quality coolant flange replacement kits are made up of direct-fitting premium material components. Includes the flange and hardware. Repeated thermal cycling of the plastic coolant flange leads to its deformation and coolant leaking. Rein recommends OE or Pentosin Pentofrost series coolants for this job. Rein coolant flange replacement kits offer a convenient Fix-It-Right-The-First-Time solution for this common but time consuming repair!