How do you install a dual foot valve on semi?

To install a dual foot valve on a semi-truck, first ensure the air system is depressurized and the truck is safely parked. Remove the existing foot valve and clean the mounting surface. Position the new dual foot valve, aligning it with the existing holes, and secure it in place with bolts. Finally, connect the air lines according to the manufacturer's specifications, ensuring all connections are tight to prevent leaks.