This is the Coolant Hose for 1.9L Vanagon that goes between the bleeder assembly on the firewall (feed) and thermostat housing (lower). It is number 5 on the chart.
Coolant Hose Chart
Blue Antifreeze for Waterwaterboxer engine
Metal Thermostat Housing (Lower)
Coolant Hose Kit for 1.9l Vanagon with plastic coolant pipes
Coolant Hose Between cross over pipe and "T" for heater core
Water Pump for 1.9l Vanagon (Economy)