Genuine OEM Stanadyne and Roosa Master diesel fuel injection pump pilot tube for DB, DB2 and JDB fuel injection pumps. These genuine tubes are worth the extra couple of dollars because they will actually fit properly in your pump. The aftermarket tubes almost always damage the housing when installing them because of poor quality fitment. Additionally the internal finish where the seals ride is a superior finish to the aftermarkets which tend to cause problems installing the unmbrella seals and flipping them causing the fuel to leak into the crank case.