Rein OE Quality coolant flange replacement kits are made up of direct-fitting premium material components. They focus on all of the parts surrounding the replacement of the cracking, leaking, swelling or deteriorating cylinder head coolant junction flange, including the flange, thermostat, temperature sensor, heater and or radiator hose(s), and associated gasket(s) and or seal(s). Repeated thermal cycling of the plastic coolant flange leads to its deformation and coolant leaking. The included replacement coolant flange is made out of virgin OE-type resin for added durability, and the included replacement hose(s) are made out of OE-type rubber compound with OE-type quick-connect hose end fittings. Replacing leaking and failing cooling system components and performing a proper coolant flush at the same time will ensure a long life of the vehicle's cooling system. 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!