Can't figure out how this part goes back in..6.0 chevy 2003
2003 Silverado 2500 HD 6.0 engine. Before you put the rear cover / oil seal on the is a piece that goes in a hole before you put the rear cover on. It is flat on one end with a o-ring and the other is round tip. It is skinny in the middle and about a few inches long. Does anyone know how this part goes in the engine.
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