We inherited an inground irrigation system with our house. Toro Controller, 8 zones, was working fine until now. Main valve at the street. Once it is on, water gushes from the white tube shown in the picture. Just started happening. I have no idea what this white tube is. I have found a few of the white tubes. Some sort of backflow or something. I am not sure what else to explain. There are valve boxes throughout the yard for each region.
Any thoughts on what these white tubes are and what the issue might be?