87 190E 2.3 Engine 102.985 Replacement pump does not match

I have purchased a replacement water pump and when in the process of installing I noticed the pump has what looks like an extra hose fitting in the 6 oclock position. The hose fitting size I.D. looks to be about 10mm. The original pump does not have this hose fitting.

I reviewed several parts sites concerning this year, model and engine and they all show pictures with this hose fitting in the 6 oclock position. I have pictures to show if necessary.

Do I have the correct water pump?

What is the fitting for?

I thank you in advance for your help.

Bryan

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