Olympus EZDilate Endoscopic Balloon Dilator Wired-guided 11, 12, 13mm. Model Number: BD-420X-1355.
Potential for the inflation chart label affixed to the shaft of the device to be incorrect and indicate a balloon diameter of 18, 19, or 20 mm,
International distribution in the country of Japan.
https://www.accessdata.fda.gov/scripts/ires/index.cfm?Product=Z-3216-2026