ESCO 90415 7 Bar Tire Inflation Cage for OTRESCO 90415 7 Bar Tire Inflation Cage for OTR The ESCO 90415 7 Bar Tire Inflation Cage for OTR is used when changing and inflating tires on large earthmovers, agricultural, 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 90415 is designed to meet OSHA regulation requirements and fits up to 29. 5R25 L 3