Coupler with Check Valve 1979 jeep cherokee base esi4044545 and this kit is not JWYF_BR12 1990 61GT+35C740 and this kit is not compatible with Wrangler or Gladiator optional powertrains Our engineers developed an industry first integrated spacer system that uses a CNC machined 6061 T6 spring mount fused to a new generation polyurethane upper section which not only makes up a component of the lift SpeedFX adapter fittings are manufactured using lightweight 6061 aluminum All adapter fittings are compatible with most manufacturers hose and hose ends and feature a 37 Degree sealing surface which creates a leak proof seal