The purpose of this amendment is to add to Part 195 regulations concerning hydrostatic testing, design pressure, and operating pressure of liquid pipelines. These regulations are the portions of Part 195 that were withheld when that new part was issued on September 29, 1969. The issuance of this amendment completes the rulemaking proceeding that was initiated by Notice 68-4 on July 12, 1968. Three unrelated amendments have also been included to modify the notice requirements of § 195.8, to clarify § 195.116, and to amend § 195.404.