This coolant hose runs from the passenger cylinder head to the coolant distribution tower.
#14 on attached schematic
Note: This specific hose is typically found on 86-87 Vanagons. Later models had a slightly different hose, 251121130B, which can be found here.
Suitable for 1986-87 Vanagon
Volkswagen Part Number 251121130A
Alternative Part Number JP-1127-0