Campbell-Parnell is a Phoenix-based company incorporated in 2002 that specializes in distributing and installing EPA-certified CNG and LPG conversion systems across the United States. The company is committed to reducing dependence on foreign oil and promoting cleaner alternatives. Its primary goal is to be the premier provider of alternative fuel systems through expanding its nationwide network and high-quality products with excellent customer service. The company's HPi technology features an innovative electronic control unit that precisely delivers alternative fuels through high-pressure regulators, fuel rails, and filters to certified vehicles.