6BT5.9 Cummins Water Inlet Connection 4988378 Parts Catalog Ref No. Part Name Part No. Required 1 Hexagon Flange Head Cap Screw 4991495 3 2 Rectangular Ring Seal 3906697 1 3 Water Inlet Connection 4988378 1 Above is the introduction of the 4988378 Cummins Water Inlet Connection, while if you need Water Inlet Connection 4988378, complete Cummins engine or other Cummins …