D&H United Fueling Solutions is the leading supplier of both petroleum fueling and EV charging system equipment, installation, and service in the Southwest. D&H United is an authorized distributor and service provider for Gilbarco Veeder-Root as well as other major equipment brands. The company has 15 branches and 500+ employees operating throughout the Southwest. D&H United also provides compliance testing for tanks and lines in 25 states through its Valley Tank Testing subsidiary.