# Electronic tubes charged with gas — Postal shipping restrictions by item category

For Electronic tubes charged with gas, carrier is USPS; restriction type is restricted; scope is all mail; conditions is Mailable without restriction if volume does not exceed 30 cubic inches and tube is charged with gas at 35 psig or less; must be packed in strong outer containers, recorded from its source on 2026-08-04.

- **Item category:** Electronic tubes charged with gas _(unconfirmed — we could not tie this to the quote below)_
- **Carrier:** USPS _(our reading, not quoted from the source)_
- **Restriction type:** restricted _(our reading, not quoted from the source)_
- **Scope:** all mail _(our reading, not quoted from the source)_
- **Conditions:** Mailable without restriction if volume does not exceed 30 cubic inches and tube is charged with gas at 35 psig or less; must be packed in strong outer containers _(unconfirmed — we could not tie this to the quote below)_

## What the source says

> Electronic Tubes: These items are mailable without restriction if the volume does not exceed 30 cubic inches and the tube is charged with gas at 35 psig or less.

## 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/).