This Crossfire Tire Equalizer Valve 110 PSI (Set of 4) not only maximizes the tire life, but it also drastically reduces problems created by the road by allowing air to freely flow from one tire to the other while maintaining equal tire pressure and load distribution. The Crossfire decreases rolling resistance for increased fuel mileage and improves the stability, braking, and overall safety because in a tire blowout, the safety feature automatically isolates the good tire by immediately closing the internal valve. These valves require little maintenance and install in minutes.