Plastic service t

Claim 1

A FITTING ATTACHABLE TO A PLASTIC MAIN COMPRISING: A PLASTIC SERVICE T HAVING A THROUGHBORE AND A LATERAL OUTLET, ONE END OF SAID T BEING SHAPED FOR ENGAGEMENT WITH AND SOLVENT WELDING TO THE PLASTIC MAIN; AND THE CORRESPONDING END OF SAID THOUGHBORE BEING AN INLET END FOR FLUID FROM THE PLASTIC MAIN; AN INTERIOR THREAD IN SAID THROUGHBORE; A PLUG HAVING AN EXTERIOR THREAD ENGAGED WITH SAID THROUGHBORE THREAD; MAIN-PERFORATING MEANS FIXED TO ONE END OF SAID PLUG FOR PROJECTION OUT OF THE INLET END OF SAID THROUGHBORE AND FOR CUTTING A SHARP EDGED PERFORATION IN THE PLASTIC MAIN BY SCREWING SAID PLUG THERETOWARD; THE IMPROVEMENT WHICH COMPRISES: A SMOOTH SURFACED COUNTERBORE IN THE INLET END OF SAID THROUGHBORE; SAID COUNTERBORE BEING RELATIVELY SHORT IN LENGTH AND SAID INTERIOR THREAD TERMINATING AT SAID COUNTERBORE; SAID COUNTERBORE PROVIDING AN AREA OF INCREASED CROSS SECTION AT SAID THROUGHBORE INLET END; BEVELLED STOP MEANS ON THE PLUG INTERENGAGEABLE WITH THE SHARP EDGES OF THE PERFORATION CUT IN THE PLASTIC MAIN FOR SEALING THE PLASTIC MAIN FROM SAID THROUGHBORE; RESTRICTED BORE MEANS INTEGRAL WITH THE OTHER END OF THE T FOR RESTRICTING THE THROUGHBORE AND PREVENTING REMOVAL OF THE PLUG FROM SAID THROUGHBORE AT SAID T OTHER END, SAID COUNTERBORE PERMITTING INSERTION OF THE PLUG FROM THE THROUGHBORE INLET END; AN INTEGRAL SADDLE-SHAPED ENLARGEMENT ON SAID ONE END OF THE T, SAID SADDLE-SHAPED ENLARGEMENT HAVING A BOTTOM END SURFACE SHAPED FOR SNUG ENGAGEMENT WITH AND SOLVENT WELDING TO SAID PLASTIC MAIN; AND STRAP-LIKE CLAMPING MEANS DETACHABLY ENGAGEABLE WITH SAID SADDLE-SHAPED ENLARGEMENT AND WITH THE PLASTIC MAIN FOR INSTALLING THE T IN OPERATIVE POSITION ON THE PLASTIC MAIN.