"Kurt Ullman" wrote in message
...
About 18 years ago when we built the house, we put in sprinklers
right after the final grading. So, due to settling and other reasons
over the years, some of the heads even at full extension are spraying
much of the water into the ground nearby and not getting full benefit.
Are there any extensions of an inch or two that I could screw in or
other method of bringing the heads up a little? The are the spray heads
and not the big ones that popup and have the arm that makes them move
around.
I tried to dig them up and move them up that way, but it did not
work and they settled back down where they were before. These are Rain
Birds.

Why not just change the sprinkler-head risers to taller ones? You'd have to
dig up each head to do this. You could install cut-off risers - which let
you adjust the head to the exact height you want. I've had to raise/lower a
few heads on my system and that's how I dealt with it.