Hey, guys recently I have noticed that my car had been leaking coolant. Luckily I caught it early and there is no damage but I want to get this fixed asap! I have a 1981 280zx and I can't figure out what this part/pipe is. Any help would be helpful full, the image below:
P.S. If you find any diagrams that have this part please post them, I couldn't find any <3

 

There are a bunch of smaller coolant hoses around the throttle body and intake. You don't need to order a specific part for it, you just need some generic coolant hose of the right size and you will have to cut to fit it. Mines a ZXT so my hoses are a little different but similar.

I'd recommend changing all of your coolant hoses (or at least the easy ones) all at once. If that one failed, the others could also fail anytime if they are all old. You'll ideally drain your coolant, replace as many hoses as you can and then refill with new coolant. If you're a real sadist, you'll change the heater hoses.