The Fuel Cock is made up of components including this Cock Assembly,fuel which is the most expensive.
Parts such as the Fuel Cock: Spring, Bolt(6x20), Hose, Gasket(6.4x11.5x0.8) (nas) are included in the Gn250 1989 (k) Australia (e24) Fuel Cock parts fiche.
The most reasonably priced component used on the Gn250 1989 (k) Australia (e24) Fuel Cock is the Spring.