The OTC 5089 Air Brake Line Release Tools are designed to separate connectors on the power steering (P/S) system and exhaust gas recirculation (EGR) coolers without damage. The tools are for use on 2003 and later medium duty trucks. The tools can also be used on connectors for other liquid and air lines. Each tool has two sizes: 3/8" and 5/8"; and 1/2" and 3/4". These tools are covered by a lifetime warranty.