# 4L — How often hazmat cylinders, cargo tanks, IBCs and portable tanks must be retested

For 4L, test or inspection is Periodic requalification; minimum test pressure is Test not required; regulation section is 49 CFR § 180.209, recorded from its source on 2026-08-06.

- **Container specification:** 4L _(verified: appears in the quote below)_
- **Test or inspection:** Periodic requalification _(our reading, not quoted from the source)_
- **Minimum test pressure:** Test not required _(verified: appears in the quote below)_
- **Regulation section:** 49 CFR § 180.209 _(verified: appears in the quote below)_

## What the source says

> 4L | Test not required

## Source

- https://www.law.cornell.edu/cfr/text/49/180.209

Last verified: 2026-08-06. Review by: 2027-08-06.
Part of [How often hazmat cylinders, cargo tanks, IBCs and portable tanks must be retested](https://referencesource.org/hazmat-container-retest-intervals/).