A component which allows the engine oil cooler line to be drained. Drain Plug for Oil Cooler. Exc.Japan Built. Part included in radiator assembly. Part is also included in radiator assembly. Part is included in radiator assembly. Radiator Drain Plug Gasket. Radiator Drain Plug. Gasket. tube. COCK ASSEMBLY,. Engine Oil Cooler Line Valve. Tank. Included with: Drain tube, OEM radiator assembly, Radiator assembly.