There is other down near the WP?
The beginning of the coolant supply to the turbo, begins at #16 pipe @ the WP.
That small tube in the middle of #16 pipe is where the 4" in length rubber hose (crossover) attaches.
With the front off, when replacing the water pump, that #16 comes off and the WP comes with 3 seals, #20 being one. #17 does not (you'll need one of those if you do your WP).
Easily replaced when doing the WP....not so much in trying to reach (or even see) thru and below everything on the engine front, with everything in place.
2007 LBZ 3500 LT3 DRW Crew Cab, Sulastics, Putnam XDR 15K, B&W 30K-Turnover GN+Companion, Ride-Rite Air...EFI'd by Rob
2008 LMM 3500WT DRW Crew Cab, 8 'Flat/GN, Workforce Alum Toolbox, Ride-Rite Air Use-ta Haves 2006-6.0 3500 WT DRW ExCab Flatbed, 2005-LLY 3500 LS DRW Crew Cab, 2002-LB7 3500 LS DRW Crew Cab I Live my life in such a way that when my feet hit the floor in the morning...Satan shudders & says "Oh shit, he's awake!"