Air Lift Performance 3H (1/4 Air Line No Tank No Comp)Air Lift Performance 3H is our most advanced air management system yet, and it took three years to develop and test until it met out standards. The system combines an easy to use and reliable air management with a design that stands the test of time. 3H combines pressure based control with ride height sensing technology. While both types of air management have been utilized before, this product harnesses the power and benefits of both systems