The tool I used is a little cube thing. Like I stated, it is for turning rear brake caliper pistons back into the caliper so you can replace the pads. It was cheap. Each side has little ears in different configurations to fit different model cars. There is a 3/8 hole on each side for an extension to attach a ratchet. I have had it for years, but the little "ears" on one side were just right to catch the cross piece in the drain.
Here is a link to a pic, I didn't know how to attach just the pic.