Predl pipe-specific Bells and compression seal gaskets provide a secure, flexible and watertight connection between the manhole base and pipe system. A built-in waterstop prevents groundwater infiltration between the liner and precast concrete structure. To facilitate precast concrete production, the Bell funnel extends to the outside profile of the manhole structure. All Predl Connecting Bells are designed to tolerate varying incoming pipe angles and elevations. This flexibility assures proper fit when connecting the concrete structure to the pipe system in the field during installation and after the structure has settled in the soil. Maximum tolerance angles between incoming pipe and Predl Bells are published and available.