Clean out plug assembly

Claim 1

A COMBINATION CLEAN OUT PLUG AND MEANS FOR SECURING SAID CLEAN OUT PLUG TO ANY ONE OF THREE DIFFERENT SIZE BALD END CLEAN OUT PIPES, SAID CLEAN OUT PLUG COMPRISING A CYLINDRICAL FERRULE, SAID CYLINDRICAL FERRULE HAVING AN EXTERNAL DIAMETER TO FIT WITHIN A BALD END OF A LARGE STANDARD SIZE CLEAN OUT PIPE, AN EXTERNAL FLANGE ON ONE END OF SAID FERRULE TO FIT OVER AND ABUT THE END OF SAID LARGE STANDARD SIZE CLEAN OUT PIPE, SAID FERRULE HAVING AN EXTERNAL CIRCUMFERENTIAL O-RING RECEIVING RECESS ADJACENT ITS OTHER END, SAID FERRULE HAVING AN INTERNAL DIAMETER TO FIT OVER A BALD END OF A SMALL STANDARD SIZE CLEAN OUT PIPE AND ALSO OF SLIGHTLY SMALLER STANDARD SIZE CLEAN OUT PIPE, SAID CYLINDRICAL FERRULE HAVING AN INTERNAL CIRCUMFERENTIAL O-RING RECEIVING RECESS ADJACENT SAID OTHER END, AND A PAIR OF O-RINGS OF ELASTIC AND COMPRESSIBLE MATERIAL, ONE O-RING BEING OF GREATER ANNULAR THICKNESS THAN THE OTHER, SAID GREATER THICKNESS O-RING FITTING IN SAID EXTERNAL O-RING RECESS TO PROVIDE A READILY REMOVABLE AND READILY REPLACEABLE PERMANENT SEALING MEANS BETWEEN SAID FERRULE AND THE LARGE STANDARD SIZE CLEAN OUT PIPE AND FITTING IN SAID INTERNAL O-RING RECESS TO PROVIDE A READILY REMOVABLE AND READILY REPLACEABLE PERMANENT SEALING MEANS BETWEEN SAID FERRULE AND SAID SMALLER STANDARD SIZE CLEAN OUT PIPE, SAID O-RING OF LESSER THICKNESS FITTING SAID INTERNAL O-RING RECESS TO PROVIDE READILY REMOVABLE AND READILY REPLACEABLE PERMANENT SEALING MEANS BETWEEN SAID FERRULE AND SAID SMALL STANDARD SIZE CLEAN OUT PIPE.