The Second Air (gsf1200st/sv/sw/sx E18) is made up of components including this Valve Assy,2nd Air Reed which is the most expensive.
Parts such as the Second Air (gsf1200st/sv/sw/sx E18): Clip, Clip, Clip, Bolt are included in the Gsf1200s 1997 (v) (e02 E04 E17 E18 E22 E24 E25 E34) Second Air (gsf1200st/sv/sw/sx E18) parts fiche.