This impeller pump hose is a genuine OEM part for Yanmar 1GM and 1GM10 marine diesel engines. The hose (cooling water elbow) connects to the impeller pump and directs seawater flow through the engine cooling system. This is a genuine Yanmar OEM product . Yanmar OEM Part Number 128170-49010 Compatible Yanmar Engines 1GM 1GM10 Questions about compatibility or Yanmar engine parts? Our marine specialists are happy to help.