My father had a sprinkler system installed in his yard and there are several heads that won't pop up. If you jiggle them a little they come right up but seem to get stuck if they sit for any length of time. Pressure seems ok so I was wondering if a lubricante might be needed to help out. I was planning on putting a silicone lubricante but wanted to be sure this was ok. I know very little about sprinkler systems.
