The last step was to install the push-to-connect inflation valves, and route and connect the air-line tubing. After removing the plastic license-plate mounting inserts, we were able to mount the inflation valves through the upper license-plate holes, where they will pull double duty as fasteners to hold the license plate to the bumper. With this done, we inflated the airbags and confirmed that there were no leaks. We wanted simplicity and low cost in our system, so we opted for manual inflation. For those who want in-cab control of the airbags and don't mind spending more money, Suspension Connection offers Firestone electric control units that include electric air compressors.