Cummins Aftercooler O-Ring Kits

Genuine Cummins 4019975 Aftercooler O-Ring Genuine Cummins 4019975 fat style aftercooler O-ring used on QSB 5.9 (below 380HP) and 6BTA 5.9 models. Sold individually

Genuine Cummins 3919853 Thin Aftercooler O-Ring Gasket Genuine Cummins thin style aftercooler O-Ring gasket for 6B and 6C models Sold indvidually 

Cummins QSC Aftercooler O-Ring Kit Replacement Kit includes: 4 larger and 5 smaller o-rings (early model aftercoolers only use 3 larger o-rings) Kit suits Cummins engines: QSC This is an aftermarket part.

Cummins 6BTA & QSB 5.9 Aftercooler O-Ring Kit Replacement Kit includes Cummins parts: 2 x 4019975 (thick) 2 x 3919853 (thin) o-rings Kit suits Cummins engines: 6BTA and QSB 5.9. Does not suit QSB 6.7 This is an aftermarket part.