17 EXTRUDED PLASTICS IN THE FORM OF TUBE, FLEXIBLE TUBES, PIPE AND HOSE FOR PLUMBING; NON-METAL PIPE CONNECTORS AND COUPLERS FOR PLUMBING, NAMELY, EQUAL AND REDUCER TEES, EQUAL AND REDUCER ELBOWS, WING BACK ELBOWS, STRAIGHT REDUCERS AND COUPLERS, COPPER TO PLASTIC COUPLING TEES, INLINE COUPLINGS; SWIVEL COUPLERS, NAMELY, FEMALE ELBOWS AND FEMALE STRAIGHT; ADAPTORS; AND HOSE PLATES