QuestionHow do i replace a rain jet sprinkler head ?
AnswerHi Mickey
You will not found these heads today, simple buy a actual brand with the same water flow and reach, like Toro, Rain Bird, Hunter...
Dig a hole around the head until reach the elbow at the bottom unscrew the head and install a new one. Be careful not to let dirt get inside the elbow.
Regards
Guillermo