As RAH's NRCS link above shows, the anti-vortex plate needs to be 1.5 times as wide as your pipe. I used a 12" wide plate of alumimum bolted over the 8" pipe with stainless all-thread:
Couple of questions on this.... did you jut heat and bend the all thread to fit the pipe? Also, can you use a bar guard with this in place, it looks like it would hinder putting one of those on the pipe?
