Abstract: Various embodiments of a tool assembly for completion of wellbores and processes of using the tool assemblies are provided. In various example embodiments a tethered receptacle in receipt of a plug member is releasably coupled to a collet. The tool assembly comprises one or more shiftable valves. In a process for controlling fluid flow in a wellbore string, the collet is released from the receptacle. Engagement of the collet with a shiftable valve causes the valve to shift from a port closed to a port open position, and to plug the central bore of a wellbore string with the plug member.