What to do if the PPR pipe joint leaks

If a pipe joint leaks and goes home, besides replacing it with a new one, what is a good way? The pipe joint itself is broken and can only be replaced with a new one; the leakage of the wire port can be removed. If there is no gasket, a rubber pad should be installed, and the rubber pad is aging. It is new, the silk mouth is thick white paint and then wrapped with hemp silk, the material is the same as the winding. If it is difficult to connect or melt with glue, it is difficult to solve