Abstract: The invention is a device for replacing the seat for an oil plug frequently found as part of an oil pan of an internal combustion engine to allow draining and includes a hollow cylinder having a shoulder for insertion through the existing seat to extent into the oil pan, an installation bolt is employed for compressing and expending the hollow cylinder outward to fixedly secure the hollow cylinder to the existing seat between the shoulder and expended cylinder and the cylinder being internally threaded adjacent the shoulder to accept a plug.