Please post Zalman Reserator 1 tower inner diameter

I am looking at building a silent HTPC. I am considering the Zalman Reserator 1 v2. I have done a lot of reading and found that the included pump is a little anemic. I have an Eheim 1048 laying around. I was wondering if it would fit inside the tower in any orientation. I have only seen pictures and some of the listed dimensions are not adding up for me. Can someone who has a Reserator 1 post the inner diameter of the tower?