| The 
            compression seal gasket is mounted in an intgrally cast-in-place GU 
            PIPE BELL Assembly which is monolithically bonded to the interior 
            manhole liner and extends to the exterior profile of the precast concrete 
            manhole.  | 
          The 
            monolithic continuous bell sleeve liner assembly prevents ground water 
            infiltration between the interface of the manhole liner and the precast 
            concrete or around cast-in-concrete mounted gaskets not in continous 
            bell sleeve assemblies. |