Cummins QSC Aftercooler O-Ring Kit Replacement
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Kit includes Cummins parts: 2 x 4019975 (thick) 2 x 3919853 (thin) o-rings.
Please note you will only require 2 of the 4 O-rings supplied in this kit. You will need to deturmine the correct O-rings at time of install to complete this job.
Kit suits Cummins engines: 6BTA and QSB 5.9. Does not suit QSB 6.7
This is an aftermarket part.