I guess you are referring to stage 2 recovery systems on pump handles which are not uniformly required. As per usual, the US is large and regulations are often

I guess you are referring to stage 2 recovery systems on pump handles which are not uniformly required. As per usual, the US is large and regulations are often bare minimums with different states implementing different interpretations or additional requirements. Here’s the 2012 EPA ruling which loosened the requirement for stage 2 recovery systems: https://www.govinfo.gov/app/details/FR-2012-05-16/2012-11846 https://www.govinfo.gov/app/details/FR-2012-05-16/2012-11846 which led directly to this move in Arizona: https://agriculture.az.gov/weights-measures/fueling/gasoline-vapor-recovery/stage-ii-vapor-recovery-decommissioning https://agriculture.az.gov/weights-measures/fueling/gasoline...