Removable valve head and seat unit

Claim 1

A REPLACEABLE VALVE UNIT FOR A VALVE BODY HAVING A SEAT AND INTERIOR THREADS THEREIN, COMPRISING, IN COMBINATION; A UNITARY BODY PORTION HAVING AN AXIAL BORE THERETHROUGH, HAVING THREADABLY MOUNTED IN THE LOWER END THEREOF A YIELDING INSERT TO FORM A WATER-TIGHT SEAL, AND HAVING A WATER PASSAGE THERETHROUGH, SAID BODY PORTION HAVING THREADS ON THE EXTERIOR PART THEREOF TO ENGAGE THE THREADS IN SAID VALVE BODY, SAID BODY PORTION HAVING WATER PORTS IN THE SIDES THEREOF BELOW SAID THREADS AND ABOVE SAID INSERT, SAID BODY PORTION HAVING INTERIOR POLYGONAL SIDE WALLS IN THE UPPER PORTION OF SAID BORE, AND HAVING A SHOULDER ACROSS THE TOP THEREOF; A SPINDLE HAVING A FLANGE IN CONTACT WITH THE UNDER PART OF SAID SHOULDER, SAID FLANGE BEING SMALLER THAN SAID BORE, SAID SPINDLE HAVING THREADS ON THE LOWER END THEREOF AND MEANS FOR HOLDING IT IN WATER-TIGHT ENGAGEMENT WITH THE SIDE WALLS OF SAID BORE, AND A POLYGONAL VALVE HEAD MOUNTED WITHIN THE POLYGONAL BORE HAVING INTERIOR MATCHING THREADS THEREIN MOUNTED ON THE LOWER END OF SAID SPINDLE, THE PLANE LOWER SURFACE OF SAID VALVE HEAD CONTACTING THE UPPER SURFACE OF SAID INSERT.