The Stovebolt Site Forums The Parking Lot '60-'66 Trucks 1961 Deluxe Heater Core- Control Valve???

I have a heater core which has an integral cable operated control valve.The valve itself is leaking.Is this valve available separately from the heater core?I've looked and can't seem to locate a heater core complete with valve or just the valve itself.Any help would be appreciated.