Cattman y-pipe dimensions

I'm working on a 3rd year mechanical engineering paper and I'm interested in the dimensions of the cattman YG5 model pipe. I was unable to find it in there online catalogue. The two of particular interest are the inner/outer diameters of the pipe, pipe thickness ect. Any information would be greatly Apreciated.

Thanks,

B.P.
bepeters@engmail.uwaterloo.ca