Why choose flowbelow products? FlowBelow products reduce fuel consumption and are a standard spec on some of the largest fleets in the country. Increase your profitability and find your competitive advantage by adding FlowBelow to your new truck and trailer spec or install as a proven upgrade to older trucks.What is flowbelow tractor aerokit? The FlowBelow Tractor AeroKit™ is a tractor mounted aerodynamics system that offers proven fuel savings of 2.23% for van, reefer, tanker and flatbed fleet operations.What trucks are flowbelow products available on? FlowBelow products are now available factory installed on your new Freightliner Cascadia, International LT, Volvo VNL, Mack Anthem, Peterbilt 579 or Kenworth T680. Hear straight from our customers about how FlowBelow's fuel saving products are changing the standards for top fleet specs.How do i contact flow customer service? Call Us. If you have any technical problem with your FLOW products and services, call us at the 1-800-804-2994 toll free or 100 from your FLOW mobile.