Empty propane tanks/cylinders are not accepted at the Materials Recovery Center or Household Hazardous Waste Facility. See “Propane Tanks” for full disposal details.
Spray Foam Insulation, 2-Part Polyurethane Foam tanks should be brought to the Household Hazardous Waste Facility.
Retailers of other compressed gasses (oxygen, helium, etc.) typically accept empty cylinders back from their customers; please consult the label or tag on the cylinder for contact information.