# -4 Closures for manholes and domes.

**Citation:** 49 CFR 178.255-4  
**Type / status:** regulation / current  
**Agency:** Pipeline and Hazardous Materials Safety Administration  
**Effective:** 2026-08-18  
**Published:** Not stated

(a) The manhole cover shall be designed to provide a secure closure of the manhole. All covers, not hinged to the tanks, shall be attached to the outside of the dome by at least 1/8 inch chain or its equivalent. Closures shall be made tight against leakage of vapor and liquid by use of gaskets of su

## Document text

(a) The manhole cover shall be designed to provide a secure closure of the manhole. All covers, not hinged to the tanks, shall be attached to the outside of the dome by at least 1/8 inch chain or its equivalent. Closures shall be made tight against leakage of vapor and liquid by use of gaskets of suitable material.

(b) [Reserved]

## Provenance

- Official: Yes
- Source: <https://www.ecfr.gov/on/2026-08-18/title-49/section-178.255-4>
- Source ID: `ecfr`
- SHA-256: `f5c3998950fb70c99308f8b8b7c3f34ff901a7422beef37cdf5e150c569a1721`
- Retrieved: 2026-08-20T05:46:20.151Z
- Exported: 2026-08-24T00:48:32.181Z
- Document slug: `49-cfr-178-255-4`

### Source metadata

```json
{
  "cfrTitle": 49,
  "part": "178",
  "section": "178.255-4",
  "subpart": "Subpart H—Specifications for Portable Tanks",
  "corpusVersion": "2026-08-18",
  "jurisdiction": "US"
}
```