This is the piston seal. The outer surface is supposed to provi…

This is the piston seal. The outer surface is supposed to provide a seal on the outer part of the housing, and the inner surface is supposed to provide a seal on the inner housing surface. As fluid pressure builds up behind this seal (stepping on the clutch), the seal is forced out and consequently moves the rest of the assembly out. The part with all the burrs on it rests on the flat surface on top.

Owner caption February 2017 · Photo 10 of 76