---
kind: "section"
citation: "46 C.F.R. § 197.322"
title: "46"
number: "197.322"
heading: "Surface-supplied helmets and masks."
url: "https://uscodex.org/cfr/46/197.322"
---

# §197.322. Surface-supplied helmets and masks.

- (a) Each surface-supplied helmet or mask must have—
  - (1) A nonreturn valve at the attachment point between helmet or mask and umbilical that closes readily and positively;
  - (2) An exhaust valve; and
  - (3) **A two-way voice communication system between the diver and the dive location or bell.**
- (b) **Each surface-supplied air helmet or mask must—**
  - (1) Ventilate at least 4.5 ACFM at any depth at which it is operated; or
  - (2) Be able to maintain the diver's inspired carbon dioxide partial pressure below 0.02 ATA when the diver is producing carbon dioxide at the rate of 1.6 standard liters per minute.

## Notes

### Authority

Authority: 33 U.S.C. 1509; 43 U.S.C. 1333; 46 U.S.C. 3306, 3703, 6101; Department of Homeland Security Delegation No. 0170.1.

### Source

Source: CGD 76-009, 43 FR 53683, Nov. 16, 1978, unless otherwise noted.