Product review (4 stars): great to have humid heating again
Wondered why I was getting shocked touching a light switch.  Discovered  my furnace humidifier was dead.  Determined the valve was the culprit.  $80 for a replacement.  Thought it might be cheaper to replace the whole unit.  A little on line shopping and found this for $28.  Got it in about  5 days with low priority shipping.  Zip to install.  Back to comfy moist heating.  No more static shocks.  : )