{"data":{"id":"us/49-cfr-179.103-4","jurisdiction":"us","citation":"49 CFR 179.103-4","heading":"-4 Safety relief devices and pressure regulators.","body":"(a) Safety relief devices and pressure regulators must be located on top of the tank near the center of the car on a nozzle, mounting plate or recess in the shell. Through or stud bolts, if used, must not enter the tank.\n(b) Metal guard of approved design must be provided to protect safety relief devices and pressure regulators from damage.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER I—PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—HAZARDOUS MATERIALS REGULATIONS","PART 179—SPECIFICATIONS FOR TANK CARS","Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120)"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"69c5b698dadeb0bfdaf3ad6b1b522e26e81965879c5ff892a3b72778b526211d","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-179.103-3","next":"us/49-cfr-179.103-5"},"notice":"GroundRules: Original legal text. Not legal advice."}