The washer tank on my 91 300D is leaking at the grommet toward the bottom of the passenger side of the tank. So I just need to replace it. My question: why is there a hole there in the first place? Another pump...for the headlights? (which my car doesn't have)

__________________
14 E250 Bluetec 4Matic "Sinclair", Palladium Silver on Black, 159k miles
06 E320 CDI "Rutherford", Black on Tan, 179k mi, Stage 1 tune, tuned TCU
91 300D "Otis", Smoke Silver on Tan, 145k mi, wastegate conversion, ALDA delete

19 Honda CR-V EX 77k mi
Fourteen other MB's owned and sold
1961 Very Tolerant Wife