The 3935959 Oil Seal ensures reliable sealing for Cummins Engine models 4BT3.9, 6BT5.9, and QSB5.9. Compatible with references 3937111, 3904353, and 3900709, it offers durable protection against oil leaks and enhances engine performance.
Supersedes:3900709, 3904353
Condition:New / OEM Quality
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