This Pipe A,water is the most expensive of the items that make up this Water Pipe/thermostat assembly.
Some items from this specific schematic: Clamp B,water Hos, Thermo Unit Assy, O-ring 17x3, Bolt,flange,6x40.
The most reasonably priced component used on the Vfr750f Interceptor 1988 (j) Germany / Kph Water Pipe/thermostat is the Bolt Flang 6x12.