{"data":{"id":"us/30-cfr-57.8535","jurisdiction":"us","citation":"30 CFR 57.8535","heading":"Seals.","body":"Seals shall be provided with a means for checking the quality of air behind the seal and a means to prevent a water head from developing unless the seal is designed to impound water.","path":["Title 30—Mineral Resources","CHAPTER I—MINE SAFETY AND HEALTH ADMINISTRATION, DEPARTMENT OF LABOR","SUBCHAPTER K—METAL AND NONMETAL MINE SAFETY AND HEALTH","PART 57—SAFETY AND HEALTH STANDARDS—UNDERGROUND METAL AND NONMETAL MINES","Subpart G—Ventilation"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-30.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:25:24Z","sha256":"fc3de7f534106f0da8ba5f8cbe63075d581f31d031f8fc0955ab598b177f453e","source_id":"us-cfr","stale":true,"prev":"us/30-cfr-57.8534","next":"us/30-cfr-57.9100"},"notice":"GroundRules: Original legal text. Not legal advice."}