# Oxygen, Refrigerated Liquid (UN1073) — Postal shipping restrictions by item category

For Oxygen, Refrigerated Liquid (UN1073), carrier is USPS; restriction type is prohibited; scope is all mail; conditions is Prohibited from mailing under any circumstances, recorded from its source on 2026-08-04.

- **Item category:** Oxygen, Refrigerated Liquid (UN1073)
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** prohibited _(our reading, not quoted from the source)_
- **Scope:** all mail _(our reading, not quoted from the source)_
- **Conditions:** Prohibited from mailing under any circumstances

## What the source says

> Oxygen, Refrigerated Liquid (UN1073): (Also known as liquid oxygen) is prohibited from mailing under any circumstances.

## Source

- https://pe.usps.com/text/pub52/pub52c3_021.htm

Last verified: 2026-08-04. Review by: 2027-08-04.
Part of [Postal shipping restrictions by item category](https://referencesource.org/shipping-restrictions-by-class/).