CFR › Title 30 › Part 74 › §74.330 CFR §74.3Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗Copy linkA CMDPSU shall consist of:(a)A pump unit,(b)A sampling head assembly, and(c)If rechargeable batteries are used in the pump unit, a battery charger.