This is the Goslyn 125 watt top mounted heater.
A lower wattage heater suitable for most applications where the Goslyn AGRD is installed indoors.
Requires a Heating Mount Adapter. Brass or Stainless Steel1 1/4 female to 1 1/2 female. Which can be purchased here.
ACO Part# 139916
Suitable for the following models:
GOS20, GOS40, GOS60