Pipe Bursting is a technique that installs a new pipe by pulling or pushing a device referred to as a bursting head through the existing pipe. The bursting head expands the existing pipe to the point that it bursts into shards that are then pressed into the surrounding soil. The new replacement pipe is pulled along behind the bursting head as the existing pipe is demolished in place. Upsizing of the new pipe to a diameter greater than the existing is possible in some circumstances.