A tube plug kit for sealing the end of a tube is provided. The tube plug kit includes a tube plug having a housing member and a locking member, an insert member having a threaded end portion received within the threaded portion of the bore and an enlarged portion positioned to be drawn within the smooth portion of the longitudinal bore in response to rotation of the insert member in the longitudinal bore. The tube plug kit also includes an actuating tool and a tapered member between the enlarged portion of the insert member and the longitudinal bore of the housing member. The enlarged portion has a recess therein for receiving the actuating tool.