ESCO 90409 3 Bar Tire Inflation CageESCO 90409 3 Bar Tire Inflation Cage The ESCO 3 Bar Tire Inflation Cage is used when changing and inflating tires on trucks, tractors, buses, and many other heavy duty vehicles. This safety cage is constructed from heavy gauge steel tubing welded to a steel base and helps protect against tire explosions during inflation and deflation. The 90409 is designed to meet OSHA regulation requirements and accommodates medium, heavy duty truck OTR, tractor, and