I used the search function and didn't find the answer I was looking for. I know from reading posts that the OD (outside diameter is about 3/4"). I am interested to know the ID (inside diameter) of the transmission line running from the trans cooler to the tranny. I am thinking of adding a Magnefine inline filter when I do the flush later this month or next. And I want to order the correct one. Appreciate the help guys.

My guess is 3/8". Anyone second that?