I have a small sprinkler system that runs a few feet to a couple sprinkler heads. It runs off the main line via a water spigot. I found this other pvc pipe that has been cut. It's about 1" in diameter or so and runs at least 2 1/2 feet into the groud. It also has another small tube that runs inside of it, looks like flex pipe. My question is, how do I find out if this line is a sprinkler system. Can I generate enough water pressure somehow to see if it activates any sprinkler heads?