12 Volt Electric Power Brake Booster Vacuum Pump 18" to 22" Specification： Warranty：2 year Condition： 100% brand new Packing include: 1- 12 volt pump 1- relay 1-vacuum pressure switch 1- vacuum hose. 1- mounting hardware kit. Feature： 1. 100 % Brand New 2. Ideal for cars when the proper amount of vacuum is not being generated. 3. Recommended for cars with 15" of vacuum or less at idle. 4. 12 Volt 5. Hooks directly to your booster 6. Great on street rods with radical camshafts 7. All wiring included with connections for fast and easy installation 8. Self adjusting inline vacuum switch, cycles the pump on & off 9. Reduced vibration 10. All necessary mounting hardware included 11. Exhaust filter 12. All wires are pre-cut and terminals installed for easier installation 13. Provide vacuum to power brake booster ，Operates when vacuum drops below 18 inches and turns off when over 22 inches. 14. Uses a highly effiecient electric pump, relay switch and sitributor with vacuum switch which