72 Midget -- Heater Valve

[Chuck_Ciaffone_at_WG-RAL@smtp.wg.com]

     Hi Y'all,
     
     Now that Winter is FINALLY over here in the sunny-ish South, I 
     have removed the heater from the 72 Midget so I can repair the 
     corroded bulkhead beneath.  I notice, while close down in 
     there, that there is some coolant  leakage around the stem of 
     the heater waterline valve.
     
     Are these repairable?  Is it possible to remove and 
     dissassemble the valve and replace some sort of packing or 
     faucet-washer?  Or, does one simply replace the entire valve?
     
     thanks,
     
     chuck ciaffone