3.0 LITER DIESEL. COOLER & COMPONENTS. Hose assy o-ring. 16 x 2mm. A component which prevents a leak at the Cooling System Bypass Line. A round Ring used to Seal between the EGR Cooler Coolant Pipe and it's mounting surface. A round Ring used to Seal between the Radiator Hose and it's mounting surface. A round Ring used to Seal between the Vacuum Line and it's mounting surface. All Required. Engine Coolant Outlet O-Ring. Engine Coolant Pipe Seal. O-Ring. Seal for Oil Pump. Included with: Connector tube, Coolant Hose, Flange, Hose assembly, Tube, Vacuum Hose, Vacuum tube, Water Outlet.