If possible, the pipe can be inserted to make–up the joint, after assembly the jack can be removed. If the pipe will be inserted into a Mechanical Joint bell, the gland can be slid over the end to hold the pipe round while the joint is made. TYTON JOINT® and TR FLEX® bells are designed to round the pipe as long as the pipe will start into the throat of the bell. Once the pipe is pushed past the gasket it will seal.