wizarduvoz

I am new to Hybrid Z .. My ride is a totally stock 1983 280ZX , 5 speed w/ T-Tops. I had a leaking "Water CocK"-(valve ) at the Heater core replaced with a rebuilt valve 2 1/2 years ago. Just last week the same problem recurred. If there is a new valve available I would prefer to go that instead of getting another rebuilt valve from Z Car Source in Arizona... Any and input is appreciated. Thanks