Adjustable clean-out means

Claim 1

ADJUSTABLE CLEAN-OUT MEANS FOR USE IN A SANITARY PLUMBING SYSTEM COMPRISING IN COMBINATION, A STATIONARY TUBULAR PIPE SECTION HAVING A LOWER END PORTION TO BE CONTIGUOUSLY CONNECTED TO THE PLUMBING SYSTEM SAID PIPE SECTION ALSO HAVING AN UPPER END PORTION FORMED WITH INTERNAL FASTENING THREADS AN AND INTERMEDIATE PORTION FORMED WITH AN INTERNAL ANNULAR RECESS HAVING A GENERALLY SQUARE CROSS-SECTION, A TUBULAR CLEAN-OUT MEMBER INSETED WITHIN THE UPPER END PORTION OF SAID PIPE SECTION TO EXTEND THEREABOVE HAVING A GENERALLY UNIFORM EXTERNAL SURFACE AT THE LOWER END PORTION AND FORMED WITH EXTERNAL FASTENING THREADS THEREABOVE FOR ENGAGEMENT WITH THE THREADS IN SAID PIPE SECTION, A REMOVABLE CLEAN-OUT PLUG IN THE UPPER END OF SAID CLEAN-OUT MEMBER AND AN O-RING POSITIONED IN SAID ANNULAR RECESSES OF SAID PIPE SECTION HAVING A PORTION FORMED COMPLEMENTALLY OF SAID GENERALLY SQUARE CROSS-SECTION OF SAID RECESS, SAID O-RING BEING FORMED OF RESILIENT MATERIAL AND ENGAGEABLE BY SAID CLEANOUT MEMBER TO EFFECT A HERMETIC SEAL BETWEEN SAID PIPE SECTION AND THE UNIFORM SURFACE OF SAID CLEAN-OUT MEMBER, SAID CLEAN-OUT MEMBER BEING FURTHER FORMED WITH A BEVELED LOWER END FOR SLIDING ENGAGEMENT INTO SAID O-RING UPON INSERTION OF SAID CLEAN-OUT MEMBER IN SAID PIPE SECTION.