Hi all, I'm getting a whine from my 2004 ram and when I checked the ps fluid it looked a little milky. After I looked around online I'm beginning to think that the new rack and pinion I put in it last summer had protective oil inside of it and that's caused contamination of the fluid.

I then found a YouTube video on how to flush it which I think is the way I'm going to go, but i dont know the power steering return line inside diameter in order to buy the hose and barb.
Anyone know?

Heres a link to the video https://youtu.be/ZzEIIGZwNG4

Thanks for any help.