Compressed Gas Cylinder Safety and Oversight Improvements Act of 2023

This bill strengthens oversight of foreign manufacturers making gas cylinders for U.S. hazardous material transport. It requires these manufacturers to undergo annual approval reviews (or 5-year reviews if they meet strict compliance criteria), answer new questions about past penalties or sanctions, and submit to mandatory annual inspections. The Department of Transportation must publish a public list of approved manufacturers and their approval durations. This directly affects foreign companies producing cylinders intended for U.S. commerce, increasing transparency and accountability in the safety certification process.