Description
MA5G – Genuine Cummins 3678838 is an M33 x 2.00 threaded plug used to close machined oil, coolant, and housing passages on multiple Cummins heavy-duty and industrial engine applications. Cummins parts-catalog data places 3678838 in water inlet connections, lubricating-oil filter heads, flywheel housings, oil-pan plumbing, and engine-barring-drive arrangements, depending on the specific engine configuration
Verified specification:
- Thread: M33 × 2.00
- Part type: Threaded plug
- Brand: Genuine Cummins OEM
3678845 and 3678846 are not crosses. They are separate plug/seal components appearing next to 3678838 in Cummins assemblies.


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