I am looking for the name of a part of a sprinkler system, so I can replace the part. I apologize for not writing in more descriptive or technical terms, I am just starting to learn about sprinkler systems.
After the sprinkler system is run in my yard, there is often water that is released from a pipe that likely runs from the main sprinkler line to the surface. Differing amounts of water are released from the pipe, I think based on how long the system is run. Sometimes it seems at least a gallon is released. There used to be a part at the top of the pipe that was shut when the system was off, and when the system was running, and when water needed to be released at the end of a run of the sprinkler system, the part would open and release water, and then close. I've spent a decent amount of time looking online and could not find the name of the part, and people at Home Depot could not name the part. I unscrewed the pipe that connected the part to the main sprinkler line. It is 16 inches long, and has screw heads at the top and bottom.
On accident, I destroyed the part I am looking for with my lawn mower.