49 C.F.R. § 192.377 Service lines: Copper.
Title 49 - Transportation
Each copper service line installed within a building must be protected against external damage.
Title 49: Transportation
PART 192—TRANSPORTATION OF NATURAL AND OTHER GAS BY PIPELINE: MINIMUM FEDERAL SAFETY STANDARDS
Subpart H—Customer Meters, Service Regulators, and Service Lines
§ 192.377 Service lines: Copper.