Strainer fitting with stopper

Claim 1

A FITTING FOR THE WASTE OUTLET OF A SINK COMPRISING CUP-SHAPED RECEPTACLE AND TAIL PIECE, SAID TAIL PIECE HAVING A SUBSTANTIALLY TUBULAR WALL OF REDUCED DIAMETER CONNECTED BY AN OFFSET SHOULDER TO SAID RECEPTACLE AND PROJECTING DOWNWARDLY THEREFROM, AN ANNULAR FLANGE FORMED AT THE UPPER EDGE OF SAID CUP-SHAPED RECEPTACLE FOR OVERLAPPING ENGAGEMENT WITH THE EDGE OF THE WASTE OUTLET OF A SINK, A PLURALITY OF SPACED LUGS EXTENDING OUTWARDLY ADJACENT TO THE JUNCTION OF SAID CUP-SHAPED RECEPTACLE AND SAID TAIL PIECE, A LOWER CLAMPING RING ENCIRCLING SAID CUP-SHAPED RECEPTACLE AND TAIL PIECE ASSEMBLY ADJACENT TO SAID SHOULDER JUNCTION, SAID LOWER CLAMPING RING BEING FORMED TO PROVIDE INWARDLY DIRECTED INDENTATIONS CONFORMING WITH SAID LUGS TO PROVIDE A SEPARABLE SECURING MEANS OF THE LOWER CLAMPING RING WITH SAID ASSEMBLY ADAPTED TO PERMIT THE LOWER CLAMPING RING TO BE ENGAGED WITH SAID ASSEMBLY BY SLIDING SAID LOWER CLAMPING RING UPWARDLY WITH SAID LUGS IN ALIGNMENT WITH SAID INDENTATIONS AND TURNING SAID LOWER CLAMPING RING TO A POSITION IN WHICH SAID LUGS ARE OUT OF REGISTER WITH SAID INDENTATIONS, AN UPPER CLAMPING RING ENCIRCLING AND SLIDABLY ENGAGING SAID CUP-SHAPED RECEPTACLE, TIGHTENING MEANS CARRIED SOLELY BY SAID LOWER CLAMPING RING AND ADAPTED TO BE MOVED ON SAID LOWER CLAMPING RING INTO PRESSING ENGAGEMENT WITH SAID UPPER CLAMPING RING TO CAUSE THE EDGE OF THE WASTE OUTLET OF THE SINK TO BE CLAMPED BETWEEN SAID ANNULAR FLANGE AND UPPER CLAMPING RING, AND SAID TIGHTENING MEANS BEING ADAPTED TO BE MOVED ON SAID LOWER CLAMPING RING OUT OF PRESSING ENGAGEMENT WITH SAID UPPER CLAMPING RING, SO THAT SAID LOWER CLAMPING RING MAY BE TURNED TO THE POSITION IN WHICH SAID LUGS ARE IN REGISTER WITH SAID INDENTATIONS TO REMOVE SAID LOWER CLAMPING RING WHILE SAID TIGHTENING MEANS IS BEING CARRIED BY SAID LOWER CLAMPING RING.