CVR Performance VP665 12V Electric Vacuum Pump Black for Chevy V8

For vehicles using engine combinations that provide little or no manifold vacuum required for braking. When vacuum drops below 15 in. of vacuum the CVR Electric Vacuum Pump activates and increases the vacuum level to 20 in. of vacuum. Complete self-contained Unit. Simply connect the positive/negative power and the Unit will regulate the vacuum level itself. Patent pending design - superior to anything on the market today. Black hard Anodized for extended wear and corrosion resistance.