Compared to the standard rubber hose, stainless steel mesh has a much lower rate of expansion. The Teflon interior of the pipe keeps resistance low and guarantees smooth flow for more direct handling. To facilitate the release of air during clutch maintenance, an adaptor is included in this kit to empty air from the U pipe (the divergence pipe located between the clutch master cylinder and release cylinder in the S13 and R32 series). This can be attached simply by replacing the standard part.