StacksVerified U.S. regulatory reference

46 CFR §64.65

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Each MPT that is designed for an external pressure of less than 7.5 psig must have a vacuum relief device.
  2. (b)A vacuum relief device for an MPT must—
    1. (1)Open at an external pressure of not less than 3 psig; and
    2. (2)Have an opening with a cross-section of 0.44 square inch or more.