---
type: restriction
id: usps-oxygen-refrigerated-liquid-un1073
asset: shipping-restrictions-by-class
title: "Oxygen, Refrigerated Liquid (UN1073) — Postal shipping restrictions by item category"
sources:
  - https://pe.usps.com/text/pub52/pub52c3_021.htm
source_quote: "Oxygen, Refrigerated Liquid (UN1073): (Also known as liquid oxygen) is prohibited from mailing under any circumstances."
generated: true
harvested: 2026-08-04
stale_after: 2027-08-04
item_category: "Oxygen, Refrigerated Liquid (UN1073)"
carrier: "USPS"
restriction_type: "prohibited"
scope: "all mail"
conditions: "Prohibited from mailing under any circumstances"
verified: true
unverified_fields: carrier, scope
---
**Item category:** Oxygen, Refrigerated Liquid (UN1073)

**Carrier:** USPS

**Restriction type:** prohibited

**Scope:** all mail

**Conditions:** Prohibited from mailing under any circumstances

> 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>