6.7 LITER DIESEL. AUXILIARY. Reservoir hose seal. A component which prevents a leak at the Engine Coolant Overflow Reservoir Hose. A component which prevents the Coolant expansion tank Hose from leaking. A round Ring used to seal between the Radiator Hose and it's mounting surface. Engine Coolant Bypass Pipe O-Ring. By - Passenger o -. Connector o -. Engine Bypass Pipe O -. Engine Overflow O -. Radiator O -. Reservoir seal. Included with: Lower Hose, Lower Reservoir Hose, Reservoir Hose, Upper Hose.