StacksVerified U.S. regulatory reference

49 CFR §178.255-4

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (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.
  2. (b)[Reserved]