First Check for leaks, Teh beauty of funny pipe its like an extension cord. Align the head at grade and go a lil below (no more than 1/2") Backfill and pack around the base of the funny pipe and sprinkler head. Then adjust the head, because you may need to remove the internals and then fill in all the way. PACK GOOD!
Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers
Thanks
Ray
Rays Above and Beyond Automatic Lawn Sprinklers