Of all the components that make up this Valve the Seat, Valve Spring has the lowest price.
Parts such as the Valve: Screw, Valve Adjusting, Spring, Valve Outer, Plate, Bolt Stopper, Bolt(62y) are included in the T25tlrb 2003 Valve parts fiche.
The sub assemblies and components that make up this Valve include this Shaft, Rocker, the most expensive part.