base flange 14 114 when the tabbed collar is substantially centered within the cylindrical flange opening thereby limiting the ability to remove the tabbed collar from the opening and holding the floor drain apparatus in place in the drain base during use when placed in the cylindrical flange opening the second set of tabs 84 a and 84 b preferably rest on the base flange to prevent the collar from falling into the drain base in this regard the second set of tabs 84 a and 84 b preferably extend farther from the circumference of the collar 80 than the first set of tabs 82 a and 82 b in order to limit the ability to slide through the cylindrical flange opening after placement of the tabbed collar 80 into the cylindrical flange opening 18 the threaded connector 22 122 may be threaded into the threaded cylindrical opening 86 thereafter as exemplified in fig1 b and 15 c the system may be used substantially as described in the previous embodiments with the seal ring 46 or extension ring 140 the tabbed collar 80 may remain in the drain base flow through opening and the grate member may be used as the drain in the finished floor however in alternate embodiments the tabbed collar 80 may.