Ram Truck DEF line plugs
thingiverse
These two plugs will fit the DEF filler and vent lines if just above the rear wheels. They are not likely a perfect seal but should provide sufficient protection from bugs and mud from contaminating the inside of the lines. Printed with PLA+ with SuperSlicer. I used 4 walls and 20% infill to make sure it was rigid enough to insert without risk of cracking.
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