This is mostly a do it yourself project. If you have a Hunter system, I would buy several sprinkler heads at ACE Hardware. They just screw on. I would also read the Hunter manual and learn how to operate the system yourself. If you hire someone to adjust and replace sprinkler heads, you may find that the heads need to be readjusted again shortly after they leave. I only hire someone when I need an underground repair, not for individual sprinkler heads.
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