What is the team fortress 2 steam product code
What is the team fortress 2 steam product code
If by Product code, you are referring to a CD-Key with which to illegally own the game, there is none, and you will not be able to own the game unless you purchase it from Valve via Steam.
However, if by Product code you mean the unique code with which each game on steam is identified, then Team Fortress 2's product code is 440.