Water Pump Drain Tube gasket??? (1987 260E)

[throne7]

Stats: 1987 260E M103 2.6L engine.

Hello all, I am trying to fix a coolant leak that gives me the warning low coolant lights. I think the leak is from the water pump vicinity because I see the fluid sprayed at the top of the cylinder collected in little crevices near the pump etc. At first I thought its the water pump. However I took a closer look and saw a brass pipe (Water Pump Drain Tube) coming out of the water pump that is already badly corroded at the location where it bolts onto the water pump. I am suspicious that the water start spraying out this corroded section at highway driving speeds, and drains the coolant. So I am going to try replacing this tube first and hope to avoid replacing the water pump as it is a big bad job.

I have on hand a Water Pump Drain Tube, however it appears to come with out as gasket. My question is does it requires a gasket? where it bolts onto the water pump? Should I go back to the dealer and buy a gasket for it? Thanks!