In regulated material service
In regulated material service means, for the purposes of the equipment leak provisions of subpart F of this part, equipment which meets the definition of in volatile organic compound service, in volatile hazardous air pollutant service, in benzene service, in vinyl chloride service, or in organic hazardous air pollutant service as defined in the referencing subpart.
40 CFR § 65.2
All terms used in this part shall have the meaning given them in the Act and in this section. If a term is defined both in this section and in other parts that reference the use of this part, the term shall have the meaning given in this section for purposes of this part. If a term is not defined in the Act or in this section, the term shall have the meaning given in the referencing subpart for purposes of this part. The terms follow: