Fill Connection 3393131 Parts Number 3393131 Parts Name Fill Connection Brand Cummins Cummins Models K50,QSK50,4B3.9, 6B5.9,QSB3.9,ISF3.8,ISF2.8 Related Posts Alternator – 3016627 Valve Spring – 3633840/3643725 Valve Insert – 3086192/3086193 Exhaust Valve Kit – 3803528 Flywheel – 3012603