A Backup Ring helps in leak testing the air-to-air aftercooler system. It works by securely sealing the internal diameter of the air-to-air aftercooler tubes, ensuring no air escapes during pressure testing. The ring prevents the test plug from being blown out under high pressure, maintaining the integrity of the system while enabling accurate testing. Paired with tube seals and test tools, the backup ring allows for controlled and accurate testing on both sides of the system.Attributes:• Seals internal diameters effectively for accurate testing results.• Withstands high-pressure levels during testing procedures.• Prevent blowout of plugs during high-pressure testing.Applications: A Backup Ring is used in leak test tools for air-to-air aftercooler systems, placed within the air-to-air aftercooler tube to seal its internal diameter during pressure and leak testing processes.