Pipe compression seal for bell and spigot joint

A pressure resistant system for joining concrete pipes in end-to-end relationship wherein said first pipe terminates in a bell end and the second pipe terminates in a complimentary spigot end telescopically received therein, the bell end defining a bell end face and an internal offset face radically and axially offset from the bell end face, and the spigot end defining a spigot end face and an external offset face radially and axially offset from the spigot end face, the end face and offset face of said bell end of said spigot being connected, respectively, by inner and outer seal mounting surfaces, said system comprising:

• a bell end sealing ring extending from the bell offset face to the bell end face along the bell seal mounting surface, said ring mounting a plurality of mutually spaced, outwardly directed, circumferential flanges embedded in said bell;
• a spigot end sealing ring extending from the spigot offset face to the spigot end face along the spigot seal mounting surface, said ring mounting a plurality of mutually spaced, inwardly directed, circumferential flanges embedded in said spigot, the end of said ring adjacent said spigot offset face mounting an integral sealing flange extending outwardly at an angle thereto and embedded in said pipe below the spigot offset surface, said ring further defining a central, circumferential, concave groove embedded in said spigot;
• and
• an O-ring seal retained in the spigot ring groove between the spigot and bell sealing rings when the spigot end is telescopically received in the bell end.