In the beginning years of CRD procedure for changing timing belt included removing the whole water pump not just front portion, so I never did this but I recently had to to replace this hose
https://imgur.com/38Nvtol
That also connects to this nipple
https://imgur.com/SKZLqKl

What a pain to replace. Luckily I noticed a slight leak from here just before doing a head gasket replacement and repaired it at same time otherwise would have been over 5 hours just to replace it.

HINT: I think it would be prudent for anyone removing rear timing cover to check this hose as possible and replace then if needed.

I know I felt of it on a couple of my others and I am surprised one of them isn't already leaking maybe it will last to next TB but I doubt it. I am sure total age is a large factor also.

I also didn't locate it easily at ID parts etc ( I didn't call them) online molar sites etc. It is a molded 90 degree bend short hose. I just took original to Napa and got something close to cut down. Maybe you could replace it with Water pump in place but I believe its easier with it off.

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05 Blu LIM, OME GDE Tbo, wk II 245/75/17, KC Lights, bull bar, 195K H TC
05 Blu Lim, Dayton, GDE HT, 255/75/18 , 210K , H TC
06 Bla Lim, GDE Eco, Destination AT 245/75/17, 151K, H TC
06 D Khaki Lim 126K wkII Eur TC
05 D khaki Lim 145k refurbishing
All CRDS: Fumoto, Lift , Fan Shroud mod, fuel head Gen II, SAMCOS,self TB, 2 Mic filt, Hayden

My old 1993 Dodge D250 Cummins had a similar 90 degree bend hose in the heater system.

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Sold to LOST member my 05 Ltd, GDE Stg II turbo + TCM tune, SunCoast TC w. Transgo kit, Steiger window regulators, Samcos, Fumoto valve, 2nd gen filter head with Lub. Spec. bleeder, Hayden clutch & 11 blade fan, inverted spare, P-1 battery, BF Goodrich Long Trail TAs, Etecno1 glow plugs, timing belt at 50K miles/8 yrs

I already had manifold loose so I got the lower rear nut back on water pump housing from above . I would really hate to do it with manifold on.

I did find a listing at ID parts later for it but it said discontinued and no listings at Rockauto, but it wasn't hard to find an acceptable replacement hose.

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05 Blu LIM, OME GDE Tbo, wk II 245/75/17, KC Lights, bull bar, 195K H TC
05 Blu Lim, Dayton, GDE HT, 255/75/18 , 210K , H TC
06 Bla Lim, GDE Eco, Destination AT 245/75/17, 151K, H TC
06 D Khaki Lim 126K wkII Eur TC
05 D khaki Lim 145k refurbishing
All CRDS: Fumoto, Lift , Fan Shroud mod, fuel head Gen II, SAMCOS,self TB, 2 Mic filt, Hayden