StacksVerified U.S. regulatory reference

43 CFR §3175.116

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (a)Composite samplers must be flow-proportional.
  2. (b)Samples must be collected using a positive-displacement pump.
  3. (c)Sample cylinders must be sized to ensure the cylinder capacity is not exceeded within the normal collection frequency.