QSB4.5 Cummins Cooler Core 3957544 Parts Catalog Ref No. Part Name Part No. Required 1 Lubricating Oil Filter Element 3890710 1 2 Hexagon Flange Head Cap Screw 3900632 14 3 Pipe Plug 3906619 1 4 O-Ring Seal 3929457 1 5 Threaded Plug 3915787 1 6 Pressure Regulator Plunger 3918428 1 7 Filter Head Adapter 3909355 1 8 Lubricating Oil Filter …