ISX15 Cummins Water Pump 4089909 Parts Catalog Ref No. Part Name Part No. Required 　 Water Pump WP1730-05 　 1 O-Ring Seal 3678724 1 2 Water Pump 4920464 1 3 Belt Tensioner Bracket 3681191 1 4 Hexagon Flange Head Cap Screw 3896408 2 5 Hexagon Flange Head Cap Screw 3681390 1 6 Hexagon Flange Head Cap Screw 3093936 2 7 …