Product review (5 stars): Works for Norcold and Dometic older Fridges
For future reference for anyone needing this part: This specific propane safety valve part (#622746001) is made for a Norcold Refrigerator. However, this part will also fit a Dometic 45 Unit that uses part number 2931656017. So, both these part numbers crossover to the same part and should work for either brand using this kind of safety valve.

I took apart the fridge propane plumbing parts and cleaned them with an ultrasonic cleaner and reassembled with this new safety valve.

Flame works better than before and the fridge is more efficient than previous operation.