Oil pressure regulation bypass routes excess oil directly to the supply side of the pump & reduces the amount of oil returned to the tank, less foaming and cavitation

This Part Fits:

Year Make Model Submodel 1986-1990 Harley-Davidson FLST Heritage Softail Base 1988-1991 Harley-Davidson FLSTC Heritage Softail Classic Base 1990-1991 Harley-Davidson FLSTF Fat Boy Base 1987-1991 Harley-Davidson FXLR Low Rider Custom Base 1982-1991 Harley-Davidson FXRS Low Glide Base 1983-1991 Harley-Davidson FXRT Sport Glide Base 1977-1982 Harley-Davidson FXS Low Rider Base 1983-1985 Harley-Davidson FXSB Low Rider – Belt Base 1984-1991 Harley-Davidson FXST Softail Standard Base 1988-1991 Harley-Davidson FXSTS Springer Softail Base 1980-1986 Harley-Davidson FXWG Wide Glide Base