Ensure your semi truck is ready for the long haul with a seamless connection of pipes, with the OTR 4" 45° Flared OD/OD Type Adapter with Expertise Built In™. Thanks to its ability to adjust to the outside diameter of a component, this replacement piece is able to connect two pipes with different sized diameters. Manufactured with notched ends for a quick and easy installation. FleetPride is your First Click in Heavy Duty®.