The Nut,flange,6mm is the lowest priced item on this Water Pipe schematic.
Parts such as the Water Pipe: Rnfct Pipe,floor, Bolt,flange,6x40, Pipe Comp,r Water, Nut,flange,6mm are included in the Cn250 Helix 1994 (r) Italy Kph Water Pipe parts fiche.
The Water Pipe assembly is constructed from several parts from which the Pipe Comp,r Water is the most expensive.