It was exactly ten years ago when I installed our backyard sprinkler system. Although in years past I had worked almost exclusively with PVC, I decided to go an easier route and use poly pipe. The connections were faster and it took next to no-time to lay the pipe. By using the saddle tees, I was able to be much more flexible in the positioning of my sprinkler heads and, I didn't have to cut-and-splice a compression tee in the line, which saved a great deal of time and aggravation.
Where is this all going? Well, I just wanted to advise any others out there that may have saddle tees that are getting-up there in age, to keep an eye out for this possible problem.
Now, I need to get cleaned-up just in case Agent Sculley decides to drop by.