The Repair Kit 1 assembly is constructed from several parts from which the Gasket Kit, Power Unit (nas) is the most expensive.
On this parts fiche the O-ring (6g8) is the most specified component.
Parts such as the Repair Kit 1: Gasket, Screw, Air Adjusting, O-ring, Pin, Float are included in the T9.9elrb/elhb/exhb 2003 Repair Kit 1 parts fiche.