Actually I stand corrected. I apologize. There are only 2 hoses, the third connection is for the power source. There are 3 connections, 2 hoses and 1 electrical.

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1995 E420 152k
1991 300D 2.5 348116 daily driver
1992 300E 2.6 196k-work in progress(head gasket)
2002 BMW 745Li 93k