Rep[laced the valve. Searched the net for parts. Found ApplinacePartsPro who had my part at a fair price. Ordered on Saturday and the part was delivered on Wednesday. The only snag was that faucets of my hot and cold lines were so old an unused (never closed or opened since 1996) that they presented small leaks around the stems when closed and reopened after repair. You should prepare for that possibility if you haven't turned the faucets off for a long time.