1229. U.S. Coast Guard Regulations require that no person may transfer oil or fuel to a vessel of 3000 gross tons constructed after June 30, 1974, unless each fuel tank vent overflow and fill pipe is equipped with a/an __________.

U.S. Coast Guard regulations mandate a fixed containment system of one barrel (42 gallons) capacity for each fuel tank vent, overflow, and fill line on vessels of 3000 gross tons constructed after June 30, 1974, to prevent oil pollution.