Cummins Engines Engine Plug size Link 5.9L CPL2071, 8.3L Most ISB , ISC , ISL , 6B , 6C, QSL, ISLG, ISQ, B&C Series, 4BT3.9, 6BT5.9, 8.3L, QSC, 355Pre 1995 , Dodge 5.9L Diesel 2003-2006 Dodge 5.9L Diesel Dodge 6.7L Diesel, QSB (bottom) M18X1.5-T14 Show plug ISX, QSX , Sig. 600 , QST30, N15, X15 M27X2.0-T12 + O-RING Show plug ISM , QSM , L10 , M11 , N14 , 444, 855, QSK50 , NTC , NT , NH, 350NT 1″-18-UNS-T12 Show plug Some, ISB , ISC , ISL , 6B , 6C, QSLOther 6.7L Diesel, 3.3L , 4.5L ,QSB (side) M22X1.5-T10 Show plug VT504 , 555 , 378V6, QSK 3/4″-16-UNF-T10 Show plug 1995-2002 Dodge 5.9L Diesel M22X1.5-LB-T15 Show plug KT1150 , QSKT19, KTTA19 1 1/16″-12-UNF-T15 Show plug A2000 , A2300 M14X1.5-T10 Show plug QSK60, QSK45 M42X2.0-T12 Show plug