Vacuum pump insulator. A Kit that contains all the necessary components to mount the Power Brake Booster Vacuum Pump to it's mounting point. A rubber ring with a hole in the center which provides protection through which Brake Vacuum Pump related components pass through. Rubber Insulator that fits between the Brake Vacuum Pump and it's mounting Bracket to minimize noise and viBration. Brake Booster Grommet. P/B BOOS. Auxiliary bushing. Auxiliary hardware. Included with: Auxiliary Pump, Auxillery Pump, Vacuum Pump.