Had this repair yesterday. When I first went out on it last week to see what equipment would be needed I thought it was just a 3" glue coupling that was leaking (since it was). However, I didn't feel this was the sole cause due to the amount of water and ensuing hole that was created. When we dug it up yesterday with the Bobcat backhoe we found that not only was the coupling leaking but an old Romac or Baker mechanical coupling had blown out. Can only assume that the leaking glue coupling created extremely soft soil which then would no longer hold the pipe in place at the mechanical coupling.