The drains are located behind the tunnel carpeting. They are about 3/4" in diameter and a few inches long...They connect the box to the bottom of the tunnel. If the material has broken away, the box will leak inside the car.

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Benzmac:
Donnie Drummonds
1992 500E (very soon I hope
1981 280GE SWB
ASE CERTIFIED MASTER AUTO TECHNICIAN
SERVICE MANAGER FOR 14 BAY FACILITY
MERCEDES SPECIALIST 8 YRS
PARTNER IN MERCEDESSHOP.COM