Take a look at the number of tools required to elevate and completely water proof a manhole chimmney. This simplicity creates a scenario for which the contractor can count on what its going to take to complete the structure. Traditional methods require many more tools. Just think of the cost avoidance when a crew is searching or waiting for a tool!
What if a single worker could install a grade adjustment in minutes, doesn't have to wait around for lifting equipment, nor look for tools? What if the task of elevation becomes so simple and easy. The answer is; cost saving!