BLOWER TYPE PSI ROOTS 184.99 157002-14 This rear drive hub works with a PSI roots style blower.

BLOWER TYPE ROOTS 114.7 157002-50 This rear drive hub works with all other roots style blowers. The 3 in 1 design of this rear drive hub has two different bolt patterns and three different internal registers which can be shimmed to fit most all other roots style blowers.

BLOWER TYPE SCREW 186.9 157502-52 This rear drive hub works with a screw style blower.

BLOWER TYPE SSI/FORCE 220.63 157002-03 This rear drive hub works with a SSI or JFR roots style blower.