Iron Traps?

[mutley racers]

Are there such things? I have been asked to install some new basins in a commercial toilet and all the pipework is iron. But do you have iron traps? And, can you use mcalpine fittings to connect iron to plastic? Some of the Iron looks like it is bigger than 2inch but smaller than 3. Are there iron pipes this size? And I know Chris won't like this, but will there be a fernco to join the iron into plastic?

 

[lame plumber]

rust like heck if its a urinal trap!