Raypak Indoor Stack Kit with Inner Adapter Panel, 009841
Required If You Install The Heater Indoors or within A Structure of Any Type. Includes Adapter Plate Matched to 406/407 Specs. Connect From The Stack Top to Duct to The Outside. Follow All Instructions For Properly Venting Heater Exhaust. Pool Heaters Discharge Carbon Monoxide and Could Be Deadly If Improperly Installed or Maintained.