This is one of the best method of replacing the pipes and drains that are buried in to the ground without making secondary drench. In this method a device called expander is used. This is pneumatic or hydraulic jet fitted at the end of the expander head followed by pulling rods. This is introduced in the pipe that is to be replaced. The expander end is busted within the pipe and the following rods replace the old pipe immediately. This is quite useful to provide drench less drain replacement solutions.