You can get a hole anywhere from the size of a fist to a quarter. The pipe deteriorates from soil conditions and age. The material thins, gets thin walls and pressure just pushes it right out.  -   Dave Zagorac     Quotes
You can get a hole anywhere from the size of a fist to a quarter. The pipe deteriorates from soil conditions and age. The material thins, gets thin walls and pressure just pushes it right out. Dave Zagorac