Ok so I have a leak in my power steering which I have found, but I cant figure out what the hose is called. If anyone can help me it would be very appreciated

Its coming from the smaller hose which is connecting to my P/S Reservoir I believe.

I Think this is it?
OEM High Pressure Power Steering Hose (NA & '94+ TT)

Its a 91 N/A 300zx Non TT

 

Are you sure it is high pressure line as shown in picture? The return lines usually tend to leak more often because they get hard and brittle and crack. Could you post a picture of where it is leaking? That would be helpful. The picture of the line that you posted, is the high pressure line. It only connects to the power steering pump and goes to the steering rack. High pressure line does not connect to the reservoir in any place. Post a picture of the leaking line and that would be easier to help.