CFR › Title 40 › Part 147 › §147.310340 CFR §147.3103Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkNotwithstanding §§ 144.28(f)(2) and 146.12(c) of this chapter, owners and operators shall not use a fluid seal as an alternative to a packer.