Being in the Lawn care industry, I work with sprinklers and irrigation on a regular basis! I constantly have customers that have problems with their pop up heads that have sunk into the ground over the years. I had to always worry about digging up the whole sprinkler and adding extensions. Now with this extension from J-9, I don’t have to worry about digging up the whole sprinkler, which saves me time and my customers money! Great product! If your in the sprinkler repair game, do yourself a favor and buy these!