# -4 Closures for manholes and domes.

- **operation:** document
- **citation:** 49 CFR 178.255-4
- **title:** -4 Closures for manholes and domes.
- **source type:** regulation
- **agency:** Pipeline and Hazardous Materials Safety Administration
- **status:** current
- **official:** true
- **published on:** Not available
- **effective on:** 2026-08-18
- **summary:** (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
- **machine formats:** - **json:** https://regulus.evalyn.ai/document/49-cfr-178-255-4.json
- **markdown:** https://regulus.evalyn.ai/document/49-cfr-178-255-4.md
- **app url:** https://regulus.evalyn.ai/document/49-cfr-178-255-4
- **source url:** https://www.ecfr.gov/on/2026-08-18/title-49/section-178.255-4
**body:**

(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]
- **truncated:** false
- **body characters:** 332