6" Sewer Septic Cover Cap

I hit our old green sewer cap for our septic system with the lawnmower, breaking about a third of it off. Took measurements, the inner diameter ring is 5 3/4" and the outer cover area is 6 1/2". I think that makes the black corrugated sewer riser 6" in diameter, but I don't know. Anyway the cap works great, even locks into the sewer riser perfectly. Print with supports. I might post a picture sometime but it looks just like the model rendering so what's the diff. Hopefully it helps y