Abstract: The lock seal includes a body comprised of two mating shells having grooves generally complementary in shape to and for reception of lock retention sleeves. The sleeves are axially aligned in the shells and have frustoconically shaped portions for receiving interiorly thereof split rings. A wire has a locking element at one end for reception in the body when assembled, whereas the opposite end carries a locking rod having axially spaced grooves. Upon insertion of the locking rod into the open end of the body, the locking rings are expanded against the walls of the frustoconically shaped sleeves to prevent withdrawal of the rod from the body.