Contact a Montgomery County licensed fire extinguisher service technician for extinguisher service and inspection. Licensed contractors can be found by clicking on the first link below and using the appropriate drop down menu. Follow manufacturer's recommendations. Some of the smaller fire extinguishers for home use are meant for replacement only. Read the manufacturer's guidelines and if the fire extinguisher is meant for disposal after expiration, do so properly at the Shady Grove Transfer Station. See DEP "How To Recycle or Dispose of Solid Waste" KBA by clicking on the second link below.