QSK50 Cummins Pressure Regulator Plunger 3627927 Parts Catalog Ref No. Part Name Part No. Required 　 Lubricating Oil Filter LF6026-03 　 1 Plain Washer 127362 12 2 Twelve Point Cap Screw 191772 12 3 Filter Head Gasket 3629387 2 5 Compression Spring 205659 2 6 Pressure Regulator Plunger 3021618 1 7 Bypass Valve Body 3028552 1 8 Hexagon Head Cap …