Heater control valve

Chrysler part number listings for heater water control valves. 1973-1974 valve 3579173 which supercedes to 4034436. 1975-1976 valve 3879337 which supercedes to 3846381. All of these numbers will interchange from 1973 thru 1976. Chrysler made minor changes in the design over the years. Some were unplated steel, some were plated steel and some had both hose nipples metal while others had one plastic hose nipple and one metal hose nipple. Also many aftermarket companies made them. One example is Four seasons 74638. If you would like to research some of these numbers then go to eBay.