Aeromotive's new Vacuum Pump Regulator allows you to control and adjust crankcase vacuum easily and effectively without the use of shims. Simply loosen the lock nut and turn to adjust. Designed to work with the Aeromotive Vacuum Pump. Attaches directly to the Aeromotive Vacuum Pump. (Note: Use port fitting P/N 15612) Equipped with (2) ORB-12 Inlet and Outlet Ports. Features a 1/8'' gauge port. Made from CNC-Machined Billet Aluminum.