THIS INVENTION RELATES TO A REMOVABLE SEAL PLUG FOR CLOSING THE UPPER END OF A SELF-PUNCHING TO FITTING. MORE PARTICULARLY, THE INVENTION RELATES TO A SELF-PUNCHING T FITTING INCLUDING A TUBULAR BODY ADAPTED TO BE WELDED TO A PIPE, A PUNCH THREADABLY POSITIONED WITHIN THE TUBULAR BODY ADAPTABLE FOR ROTATION TO ENGAGE AND PUNCH A HOLE IN THE PIPE, AND AN IMPROVED SEAL PLUG MEMBER FOR CLOSING THE UPPER END OF THE TUBULAR BODY MEMBER, THE PLUG MEMBER SERVING TO ACCURATELY POSITION AND PREVENT THE MOVEMENT OF THE PUNCH MEMBER IN THE BODY AND TO SECURELY SEAL THE BODY AGAINST FLUID LEAKAGE.