2009-12. Inlet hose o-ring. REAR. A seal that prevents oil from leaking out, or contaminants from enteRing the Cooling System Crossover Line. A seal that prevents oil from leaking out, or contaminants from enteRing the Engine Coolant Inlet Housing. All Required. Engine Coolant Bypass Pipe O-Ring. O-Ring. hose o -. Cooling System Crossover Line O -. Engine Bypass O -. Engine Flange O -. Intake tube o -. Included with: Inlet hose, Intake tube, Tube Part cannot be reused/reinstalled, Water Inlet Pipe.