MSHA - Code of Federal Regulations - 30 CFR 57.8535
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MSHA - Title 30 CFR
30 CFR § 57.8535

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.

Subpart H--Loading, Hauling, and Dumping

Source: 53 FR 32526, Aug. 25, 1988, unless otherwise noted.