The most reasonably priced component used on the Nrx1800da Valkyrie Rune 2004 (4) Usa Air Injection Valve is the Clip,tank Hose.
Check out any of the three Air Injection Valve components enlisted.
Parts such as the Air Injection Valve: Valve Assy., Clip,tank Hose, Tube, Air In. are included in the Nrx1800da Valkyrie Rune 2004 (4) Usa Air Injection Valve parts fiche.