Leaking oil pipe on 300tdi but don't know what it is??!!

Dear forum,
Most grateful for anyone's help please. I have a pipe leaking oil on my 300 tdi 90 and it's making a royal mess. I have attached a photograph from underneath. I've looked in the Haynes and I can't identify it to get a replacement. Could anyone tell me what it is so I can order a replacement or even fix it but there appears to be know way of tightening it up?
Thank you very kind...
Steve.

Oil cooler hose.

Cheers Flossie, reaching for the laptop now!
Thanks so much.

I don't know how much they cost but a hose repair place will almost certainly be cheaper if any are open. Pirtek are well known but usually more expensive than independent places. They will reuse the steel tube parts and replace the rubber hose and recrimp it on with new ferrules.

Pretty much any tractor dealer will be able to make one up too

It might be just the o ring that's leaking, give it a wipe then run the engine & re-check there is an o ring on the end of
the pipes. Ive just replaced a set today as I fitted a allisport intercooler & oil cooler, they are different fittings if you were
closer you could have had the ones I removed, ive also got new o rings.

Pirtek are expensive charged us 180 quid for 2 hoses for a tail lift on a transit.

Cheers guys, ordered a set which should do the job. Just need to clean up the diff and chassis areas, must have been leaking for a while but better than cutting the grass in lockdown!